21251063253222 has 64 divisors (see below), whose sum is σ = 51533787859200. Its totient is φ = 6437708792640.

The previous prime is 21251063253193. The next prime is 21251063253247. The reversal of 21251063253222 is 22235236015212.

It is a happy number.

21251063253222 is a `hidden beast` number, since 2 + 1 + 2 + 5 + 1 + 0 + 6 + 325 + 322 + 2 = 666.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 3668208 + ... + 7480499.

It is an arithmetic number, because the mean of its divisors is an integer number (805215435300).

Almost surely, 2^{21251063253222} is an apocalyptic number.

21251063253222 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

21251063253222 is an abundant number, since it is smaller than the sum of its proper divisors (30282724605978).

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

21251063253222 is a wasteful number, since it uses less digits than its factorization.

21251063253222 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11151938 (or 11151932 counting only the distinct ones).

The product of its (nonzero) digits is 86400, while the sum is 36.

Adding to 21251063253222 its reverse (22235236015212), we get a palindrome (43486299268434).

The spelling of 21251063253222 in words is "twenty-one trillion, two hundred fifty-one billion, sixty-three million, two hundred fifty-three thousand, two hundred twenty-two".