21376026057 has 8 divisors (see below), whose sum is σ = 30001440160. Its totient is φ = 13500648000.

The previous prime is 21376026053. The next prime is 21376026073. The reversal of 21376026057 is 75062067312.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 21376026057 - 2² = 21376026053 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21376026053) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 187508944 + ... + 187509057.

It is an arithmetic number, because the mean of its divisors is an integer number (3750180020).

Almost surely, 2^21376026057 is an apocalyptic number.

It is an amenable number.

21376026057 is a deficient number, since it is larger than the sum of its proper divisors (8625414103).

21376026057 is a wasteful number, since it uses less digits than its factorization.

21376026057 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 375018023.

The product of its (nonzero) digits is 105840, while the sum is 39.

The spelling of 21376026057 in words is "twenty-one billion, three hundred seventy-six million, twenty-six thousand, fifty-seven".