21244056052 has 24 divisors (see below), whose sum is σ = 39402296640. Its totient is φ = 9987473280.

The previous prime is 21244056037. The next prime is 21244056079. The reversal of 21244056052 is 25065044212.

It is a hoax number, since the sum of its digits (31) coincides with the sum of the digits of its distinct prime factors.

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, 81402 + ... + 221617.

It is an arithmetic number, because the mean of its divisors is an integer number (1641762360).

Almost surely, 2^21244056052 is an apocalyptic number.

It is an amenable number.

21244056052 is a deficient number, since it is larger than the sum of its proper divisors (18158240588).

21244056052 is a wasteful number, since it uses less digits than its factorization.

21244056052 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 304071 (or 304069 counting only the distinct ones).

The product of its (nonzero) digits is 19200, while the sum is 31.

The spelling of 21244056052 in words is "twenty-one billion, two hundred forty-four million, fifty-six thousand, fifty-two".