21262248528 has 80 divisors (see below), whose sum is σ = 59163118080. Its totient is φ = 6558233472.

The previous prime is 21262248523. The next prime is 21262248533. The reversal of 21262248528 is 82584226212.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (21262248523) and next prime (21262248533).

It is a self number, because there is not a number n which added to its sum of digits gives 21262248528.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21262248523) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 231876 + ... + 310307.

It is an arithmetic number, because the mean of its divisors is an integer number (739538976).

Almost surely, 2^21262248528 is an apocalyptic number.

It is an amenable number.

21262248528 is an abundant number, since it is smaller than the sum of its proper divisors (37900869552).

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

21262248528 is a wasteful number, since it uses less digits than its factorization.

21262248528 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 542256 (or 542250 counting only the distinct ones).

The product of its digits is 245760, while the sum is 42.

The spelling of 21262248528 in words is "twenty-one billion, two hundred sixty-two million, two hundred forty-eight thousand, five hundred twenty-eight".