21235565528 has 16 divisors (see below), whose sum is σ = 39821712480. Its totient is φ = 10616442208.

The previous prime is 21235565489. The next prime is 21235565531. The reversal of 21235565528 is 82556553212.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 98576 + ... + 228447.

It is an arithmetic number, because the mean of its divisors is an integer number (2488857030).

Almost surely, 2^21235565528 is an apocalyptic number.

It is an amenable number.

21235565528 is a deficient number, since it is larger than the sum of its proper divisors (18586146952).

21235565528 is a wasteful number, since it uses less digits than its factorization.

21235565528 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 335146 (or 335142 counting only the distinct ones).

The product of its digits is 720000, while the sum is 44.

The spelling of 21235565528 in words is "twenty-one billion, two hundred thirty-five million, five hundred sixty-five thousand, five hundred twenty-eight".