21972246812 has 48 divisors (see below), whose sum is σ = 39589482240. Its totient is φ = 10664395392.

The previous prime is 21972246761. The next prime is 21972246847. The reversal of 21972246812 is 21864227912.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 33959873 + ... + 33960519.

It is an arithmetic number, because the mean of its divisors is an integer number (824780880).

Almost surely, 2^21972246812 is an apocalyptic number.

It is an amenable number.

21972246812 is a deficient number, since it is larger than the sum of its proper divisors (17617235428).

21972246812 is a wasteful number, since it uses less digits than its factorization.

21972246812 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1610 (or 1608 counting only the distinct ones).

The product of its digits is 193536, while the sum is 44.

The spelling of 21972246812 in words is "twenty-one billion, nine hundred seventy-two million, two hundred forty-six thousand, eight hundred twelve".