21387101757 has 16 divisors (see below), whose sum is σ = 32594151552. Its totient is φ = 12219595200.

The previous prime is 21387101693. The next prime is 21387101777. The reversal of 21387101757 is 75710178312.

It is not a de Polignac number, because 21387101757 - 2⁶ = 21387101693 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21387101777) by changing a digit.

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 15 ways as a sum of consecutive naturals, for example, 107263 + ... + 232979.

It is an arithmetic number, because the mean of its divisors is an integer number (2037134472).

Almost surely, 2^21387101757 is an apocalyptic number.

It is an amenable number.

21387101757 is a deficient number, since it is larger than the sum of its proper divisors (11207049795).

21387101757 is a wasteful number, since it uses less digits than its factorization.

21387101757 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 133828.

The product of its (nonzero) digits is 82320, while the sum is 42.

The spelling of 21387101757 in words is "twenty-one billion, three hundred eighty-seven million, one hundred one thousand, seven hundred fifty-seven".