21234511935 has 128 divisors (see below), whose sum is σ = 46550568960. Its totient is φ = 8943395328.

The previous prime is 21234511901. The next prime is 21234511951. The reversal of 21234511935 is 53911543212.

It is a happy number.

21234511935 is a `hidden beast` number, since 2 + 12 + 3 + 451 + 193 + 5 = 666.

It is not a de Polignac number, because 21234511935 - 2⁹ = 21234511423 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 21234511935.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 127 ways as a sum of consecutive naturals, for example, 8020782 + ... + 8023428.

It is an arithmetic number, because the mean of its divisors is an integer number (363676320).

Almost surely, 2^21234511935 is an apocalyptic number.

21234511935 is an abundant number, since it is smaller than the sum of its proper divisors (25316057025).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21234511935 is a wasteful number, since it uses less digits than its factorization.

21234511935 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3334 (or 3328 counting only the distinct ones).

The product of its digits is 32400, while the sum is 36.

The spelling of 21234511935 in words is "twenty-one billion, two hundred thirty-four million, five hundred eleven thousand, nine hundred thirty-five".