21536044435 has 16 divisors (see below), whose sum is σ = 26559955296. Its totient is φ = 16751674368.

The previous prime is 21536044421. The next prime is 21536044483. The reversal of 21536044435 is 53444063512.

It is a cyclic number.

It is not a de Polignac number, because 21536044435 - 2¹⁵ = 21536011667 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (37).

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21536044394 and 21536044403.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 235107 + ... + 313603.

It is an arithmetic number, because the mean of its divisors is an integer number (1659997206).

Almost surely, 2^21536044435 is an apocalyptic number.

21536044435 is a deficient number, since it is larger than the sum of its proper divisors (5023910861).

21536044435 is a wasteful number, since it uses less digits than its factorization.

21536044435 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 80022.

The product of its (nonzero) digits is 172800, while the sum is 37.

The spelling of 21536044435 in words is "twenty-one billion, five hundred thirty-six million, forty-four thousand, four hundred thirty-five".