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21355655312 = 241399602363
BaseRepresentation
bin10011111000111001…
…010111000010010000
32001010022102200201202
4103320321113002100
5322214021432222
613451033450332
71354133034515
oct237071270220
961108380652
1021355655312
11906978aa12
12417bb709a8
1320244cb144
14106837330c
1584eca1892
hex4f8e57090

21355655312 has 20 divisors (see below), whose sum is σ = 41674259760. Its totient is φ = 10601007648.

The previous prime is 21355655311. The next prime is 21355655351.

21355655312 is nontrivially palindromic in base 10.

It is not an unprimeable number, because it can be changed into a prime (21355655311) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4798958 + ... + 4803405.

It is an arithmetic number, because the mean of its divisors is an integer number (2083712988).

Almost surely, 221355655312 is an apocalyptic number.

It is an amenable number.

21355655312 is a deficient number, since it is larger than the sum of its proper divisors (20318604448).

21355655312 is a wasteful number, since it uses less digits than its factorization.

21355655312 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9602510 (or 9602504 counting only the distinct ones).

The product of its digits is 135000, while the sum is 38.

The spelling of 21355655312 in words is "twenty-one billion, three hundred fifty-five million, six hundred fifty-five thousand, three hundred twelve".

Divisors: 1 2 4 8 16 139 278 556 1112 2224 9602363 19204726 38409452 76818904 153637808 1334728457 2669456914 5338913828 10677827656 21355655312