21105367235415 has 24 divisors (see below), whose sum is σ = 36586578935088. Its totient is φ = 11254982814720.

The previous prime is 21105367235411. The next prime is 21105367235441. The reversal of 21105367235415 is 51453276350112.

21105367235415 is a `hidden beast` number, since 2 + 1 + 1 + 0 + 5 + 36 + 72 + 3 + 541 + 5 = 666.

It is not a de Polignac number, because 21105367235415 - 2² = 21105367235411 is a prime.

It is a super-2 number, since 2×21105367235415² (a number of 27 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21105367235411) 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, 24849469 + ... + 25684758.

It is an arithmetic number, because the mean of its divisors is an integer number (1524440788962).

Almost surely, 2^{21105367235415} is an apocalyptic number.

21105367235415 is a deficient number, since it is larger than the sum of its proper divisors (15481211699673).

21105367235415 is a wasteful number, since it uses less digits than its factorization.

21105367235415 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 50543519 (or 50543516 counting only the distinct ones).

The product of its (nonzero) digits is 756000, while the sum is 45.

The spelling of 21105367235415 in words is "twenty-one trillion, one hundred five billion, three hundred sixty-seven million, two hundred thirty-five thousand, four hundred fifteen".