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21110100121221 = 3169318892200291
BaseRepresentation
bin1001100110011000101000…
…00001001101011010000101
32202202002212011200121000020
410303030110001031122011
510231331441112334341
6112521502432205353
74306103650246656
oct463142401153205
982662764617006
1021110100121221
1167a981a1a7651
12244b341999859
13ba189b7331a7
1452da3ccab52d
152691c73c0566
hex13331404d685

21110100121221 has 16 divisors (see below), whose sum is σ = 28178347538880. Its totient is φ = 14057635207680.

The previous prime is 21110100121157. The next prime is 21110100121259. The reversal of 21110100121221 is 12212100101112.

It is a happy number.

It is not a de Polignac number, because 21110100121221 - 26 = 21110100121157 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 21110100121221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21110100121021) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 8494086 + ... + 10694376.

It is an arithmetic number, because the mean of its divisors is an integer number (1761146721180).

Almost surely, 221110100121221 is an apocalyptic number.

It is an amenable number.

21110100121221 is a deficient number, since it is larger than the sum of its proper divisors (7068247417659).

21110100121221 is a wasteful number, since it uses less digits than its factorization.

21110100121221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2203876.

The product of its (nonzero) digits is 16, while the sum is 15.

Adding to 21110100121221 its reverse (12212100101112), we get a palindrome (33322200222333).

The spelling of 21110100121221 in words is "twenty-one trillion, one hundred ten billion, one hundred million, one hundred twenty-one thousand, two hundred twenty-one".

Divisors: 1 3 1693 1889 5079 5667 2200291 3198077 6600873 9594231 3725092663 4156349699 11175277989 12469049097 7036700040407 21110100121221