21501033522 has 16 divisors (see below), whose sum is σ = 43067328480. Its totient is φ = 7156134272.

The previous prime is 21501033493. The next prime is 21501033539. The reversal of 21501033522 is 22533010512.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 21501033492 and 21501033501.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2714943 + ... + 2722850.

It is an arithmetic number, because the mean of its divisors is an integer number (2691708030).

Almost surely, 2^21501033522 is an apocalyptic number.

21501033522 is an abundant number, since it is smaller than the sum of its proper divisors (21566294958).

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

21501033522 is a wasteful number, since it uses less digits than its factorization.

21501033522 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5438457.

The product of its (nonzero) digits is 1800, while the sum is 24.

The spelling of 21501033522 in words is "twenty-one billion, five hundred one million, thirty-three thousand, five hundred twenty-two".