21105702455 has 8 divisors (see below), whose sum is σ = 26659834800. Its totient is φ = 15995900736.

The previous prime is 21105702439. The next prime is 21105702463. The reversal of 21105702455 is 55420750112.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 21105702455 - 2⁴ = 21105702439 is a prime.

It is a super-2 number, since 2×21105702455² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 111082550 + ... + 111082739.

It is an arithmetic number, because the mean of its divisors is an integer number (3332479350).

Almost surely, 2^21105702455 is an apocalyptic number.

21105702455 is a deficient number, since it is larger than the sum of its proper divisors (5554132345).

21105702455 is a wasteful number, since it uses less digits than its factorization.

21105702455 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 222165313.

The product of its (nonzero) digits is 14000, while the sum is 32.

The spelling of 21105702455 in words is "twenty-one billion, one hundred five million, seven hundred two thousand, four hundred fifty-five".