21122312444 has 12 divisors (see below), whose sum is σ = 36966144264. Its totient is φ = 10560556944.

The previous prime is 21122312413. The next prime is 21122312509. The reversal of 21122312444 is 44421322112.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 65207 + ... + 215630.

It is an arithmetic number, because the mean of its divisors is an integer number (3080512022).

Almost surely, 2^21122312444 is an apocalyptic number.

It is an amenable number.

21122312444 is a deficient number, since it is larger than the sum of its proper divisors (15843831820).

21122312444 is a wasteful number, since it uses less digits than its factorization.

21122312444 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 299644 (or 299642 counting only the distinct ones).

The product of its digits is 3072, while the sum is 26.

Adding to 21122312444 its reverse (44421322112), we get a palindrome (65543634556).

The spelling of 21122312444 in words is "twenty-one billion, one hundred twenty-two million, three hundred twelve thousand, four hundred forty-four".