21756034635 has 8 divisors (see below), whose sum is σ = 34809655440. Its totient is φ = 11603218464.

The previous prime is 21756034609. The next prime is 21756034637. The reversal of 21756034635 is 53643065712.

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

It is not a de Polignac number, because 21756034635 - 2⁶ = 21756034571 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21756034637) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 725201140 + ... + 725201169.

It is an arithmetic number, because the mean of its divisors is an integer number (4351206930).

Almost surely, 2^21756034635 is an apocalyptic number.

21756034635 is a deficient number, since it is larger than the sum of its proper divisors (13053620805).

21756034635 is a wasteful number, since it uses less digits than its factorization.

21756034635 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1450402317.

The product of its (nonzero) digits is 453600, while the sum is 42.

The spelling of 21756034635 in words is "twenty-one billion, seven hundred fifty-six million, thirty-four thousand, six hundred thirty-five".