21122410644 has 72 divisors (see below), whose sum is σ = 54389305152. Its totient is φ = 6910606080.

The previous prime is 21122410613. The next prime is 21122410651. The reversal of 21122410644 is 44601422112.

21122410644 is a `hidden beast` number, since 2 + 1 + 1 + 2 + 2 + 4 + 10 + 644 = 666.

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 23 ways as a sum of consecutive naturals, for example, 393799 + ... + 444209.

It is an arithmetic number, because the mean of its divisors is an integer number (755407016).

Almost surely, 2^21122410644 is an apocalyptic number.

It is an amenable number.

21122410644 is an abundant number, since it is smaller than the sum of its proper divisors (33266894508).

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

21122410644 is a wasteful number, since it uses less digits than its factorization.

21122410644 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 50637 (or 50632 counting only the distinct ones).

The product of its (nonzero) digits is 3072, while the sum is 27.

Adding to 21122410644 its reverse (44601422112), we get a palindrome (65723832756).

The spelling of 21122410644 in words is "twenty-one billion, one hundred twenty-two million, four hundred ten thousand, six hundred forty-four".