21151443442988 has 12 divisors (see below), whose sum is σ = 37285208697912. Its totient is φ = 10498526672160.

The previous prime is 21151443442979. The next prime is 21151443443021. The reversal of 21151443442988 is 88924434415112.

It is an unprimeable number.

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, 19298761718 + ... + 19298762813.

It is an arithmetic number, because the mean of its divisors is an integer number (3107100724826).

Almost surely, 2^{21151443442988} is an apocalyptic number.

It is an amenable number.

21151443442988 is a deficient number, since it is larger than the sum of its proper divisors (16133765254924).

21151443442988 is a wasteful number, since it uses less digits than its factorization.

21151443442988 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 38597524672 (or 38597524670 counting only the distinct ones).

The product of its digits is 8847360, while the sum is 56.

The spelling of 21151443442988 in words is "twenty-one trillion, one hundred fifty-one billion, four hundred forty-three million, four hundred forty-two thousand, nine hundred eighty-eight".