21499655699412 has 72 divisors (see below), whose sum is σ = 59873928764832. Its totient is φ = 6450541752000.

The previous prime is 21499655699411. The next prime is 21499655699441.

21499655699412 is a `hidden beast` number, since 2 + 1 + 4 + 99 + 65 + 5 + 69 + 9 + 412 = 666.

21499655699412 is nontrivially palindromic in base 10.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21499655699411) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 268732578 + ... + 268812569.

It is an arithmetic number, because the mean of its divisors is an integer number (831582343956).

Almost surely, 2^{21499655699412} is an apocalyptic number.

21499655699412 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is an amenable number.

21499655699412 is an abundant number, since it is smaller than the sum of its proper divisors (38374273065420).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21499655699412 is a wasteful number, since it uses less digits than its factorization.

21499655699412 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 537545269 (or 537545264 counting only the distinct ones).

The product of its digits is 377913600, while the sum is 72.

The spelling of 21499655699412 in words is "twenty-one trillion, four hundred ninety-nine billion, six hundred fifty-five million, six hundred ninety-nine thousand, four hundred twelve".