21522215244 has 48 divisors (see below), whose sum is σ = 50747496800. Its totient is φ = 7098679296.

The previous prime is 21522215243. The next prime is 21522215251. The reversal of 21522215244 is 44251222512.

It is not an unprimeable number, because it can be changed into a prime (21522215243) 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, 995154 + ... + 1016550.

Almost surely, 2^21522215244 is an apocalyptic number.

It is an amenable number.

21522215244 is an abundant number, since it is smaller than the sum of its proper divisors (29225281556).

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

21522215244 is a wasteful number, since it uses less digits than its factorization.

21522215244 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22282 (or 22280 counting only the distinct ones).

The product of its digits is 12800, while the sum is 30.

Adding to 21522215244 its reverse (44251222512), we get a palindrome (65773437756).

The spelling of 21522215244 in words is "twenty-one billion, five hundred twenty-two million, two hundred fifteen thousand, two hundred forty-four".