21974618639372 has 12 divisors (see below), whose sum is σ = 43949237278800. Its totient is φ = 9417693702576.

The previous prime is 21974618639339. The next prime is 21974618639377. The reversal of 21974618639372 is 27393681647912.

It is a happy number.

21974618639372 is an admirable number.

It is not an unprimeable number, because it can be changed into a prime (21974618639377) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 392403904247 + ... + 392403904302.

It is an arithmetic number, because the mean of its divisors is an integer number (3662436439900).

Almost surely, 2^{21974618639372} is an apocalyptic number.

It is an amenable number.

21974618639372 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

21974618639372 is a wasteful number, since it uses less digits than its factorization.

21974618639372 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 784807808560 (or 784807808558 counting only the distinct ones).

The product of its digits is 164602368, while the sum is 68.

The spelling of 21974618639372 in words is "twenty-one trillion, nine hundred seventy-four billion, six hundred eighteen million, six hundred thirty-nine thousand, three hundred seventy-two".