21022002522 has 32 divisors (see below), whose sum is σ = 46742880960. Its totient is φ = 7003236240.

The previous prime is 21022002517. The next prime is 21022002523. The reversal of 21022002522 is 22520022012.

21022002522 is a `hidden beast` number, since 210 + 2 + 200 + 252 + 2 = 666.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a junction number, because it is equal to n+sod(n) for n = 21022002495 and 21022002504.

It is not an unprimeable number, because it can be changed into a prime (21022002523) 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, 19929 + ... + 206012.

It is an arithmetic number, because the mean of its divisors is an integer number (1460715030).

Almost surely, 2^21022002522 is an apocalyptic number.

21022002522 is an abundant number, since it is smaller than the sum of its proper divisors (25720878438).

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

21022002522 is a wasteful number, since it uses less digits than its factorization.

21022002522 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 227675 (or 227669 counting only the distinct ones).

The product of its (nonzero) digits is 320, while the sum is 18.

Adding to 21022002522 its reverse (22520022012), we get a palindrome (43542024534).

The spelling of 21022002522 in words is "twenty-one billion, twenty-two million, two thousand, five hundred twenty-two".