21222040252 has 24 divisors (see below), whose sum is σ = 42464419200. Its totient is φ = 9090801840.

The previous prime is 21222040207. The next prime is 21222040271. The reversal of 21222040252 is 25204022212.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 121774 + ... + 239317.

It is an arithmetic number, because the mean of its divisors is an integer number (1769350800).

Almost surely, 2^21222040252 is an apocalyptic number.

It is an amenable number.

21222040252 is an abundant number, since it is smaller than the sum of its proper divisors (21242378948).

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

21222040252 is a wasteful number, since it uses less digits than its factorization.

21222040252 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 363201 (or 363199 counting only the distinct ones).

The product of its (nonzero) digits is 1280, while the sum is 22.

Adding to 21222040252 its reverse (25204022212), we get a palindrome (46426062464).

The spelling of 21222040252 in words is "twenty-one billion, two hundred twenty-two million, forty thousand, two hundred fifty-two".