64157124021 has 4 divisors (see below), whose sum is σ = 85542832032. Its totient is φ = 42771416012.

The previous prime is 64157124013. The next prime is 64157124029. The reversal of 64157124021 is 12042175146.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is an interprime number because it is at equal distance from previous prime (64157124013) and next prime (64157124029).

It is a cyclic number.

It is not a de Polignac number, because 64157124021 - 2³ = 64157124013 is a prime.

It is a super-2 number, since 2×64157124021² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64157124029) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10692854001 + ... + 10692854006.

It is an arithmetic number, because the mean of its divisors is an integer number (21385708008).

Almost surely, 2^64157124021 is an apocalyptic number.

It is an amenable number.

64157124021 is a deficient number, since it is larger than the sum of its proper divisors (21385708011).

64157124021 is a wasteful number, since it uses less digits than its factorization.

64157124021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21385708010.

The product of its (nonzero) digits is 13440, while the sum is 33.

Adding to 64157124021 its reverse (12042175146), we get a palindrome (76199299167).

The spelling of 64157124021 in words is "sixty-four billion, one hundred fifty-seven million, one hundred twenty-four thousand, twenty-one".