21870535535 has 16 divisors (see below), whose sum is σ = 27201266400. Its totient is φ = 16867357056.

The previous prime is 21870535483. The next prime is 21870535549. The reversal of 21870535535 is 53553507812.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 21870535535 - 2⁸ = 21870535279 is a prime.

It is a congruent number.

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, 522125 + ... + 562454.

It is an arithmetic number, because the mean of its divisors is an integer number (1700079150).

Almost surely, 2^21870535535 is an apocalyptic number.

21870535535 is a deficient number, since it is larger than the sum of its proper divisors (5330730865).

21870535535 is a wasteful number, since it uses less digits than its factorization.

21870535535 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1084730.

The product of its (nonzero) digits is 630000, while the sum is 44.

The spelling of 21870535535 in words is "twenty-one billion, eight hundred seventy million, five hundred thirty-five thousand, five hundred thirty-five".