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20121111201021 = 341971686456391
BaseRepresentation
bin1001001001100110011111…
…01011111000010011111101
32122020120002211112222101120
410210303033223320103331
510114131013431413041
6110443302203301153
74144462615161255
oct444631753702375
978216084488346
1020121111201021
116458351797a06
12230b73351a7b9
13b2c5497711ac
144d7c1cdba965
1524d5e2686366
hex124ccfaf84fd

20121111201021 has 16 divisors (see below), whose sum is σ = 27765818037888. Its totient is φ = 12951985075200.

The previous prime is 20121111201017. The next prime is 20121111201031. The reversal of 20121111201021 is 12010211112102.

It is a happy number.

It is not a de Polignac number, because 20121111201021 - 22 = 20121111201017 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20121111201031) 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, 843216265 + ... + 843240126.

It is an arithmetic number, because the mean of its divisors is an integer number (1735363627368).

Almost surely, 220121111201021 is an apocalyptic number.

It is an amenable number.

20121111201021 is a deficient number, since it is larger than the sum of its proper divisors (7644706836867).

20121111201021 is a wasteful number, since it uses less digits than its factorization.

20121111201021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1686456532.

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

Adding to 20121111201021 its reverse (12010211112102), we get a palindrome (32131322313123).

The spelling of 20121111201021 in words is "twenty trillion, one hundred twenty-one billion, one hundred eleven million, two hundred one thousand, twenty-one".

Divisors: 1 3 41 97 123 291 3977 11931 1686456391 5059369173 69144712031 163586269927 207434136093 490758809781 6707037067007 20121111201021