21357162057 has 32 divisors (see below), whose sum is σ = 35901757440. Its totient is φ = 10969960320.

The previous prime is 21357162019. The next prime is 21357162083. The reversal of 21357162057 is 75026175312.

It is a happy number.

It is not a de Polignac number, because 21357162057 - 2¹¹ = 21357160009 is a prime.

It is a super-2 number, since 2×21357162057² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (21357162007) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 498853 + ... + 539970.

It is an arithmetic number, because the mean of its divisors is an integer number (1121929920).

Almost surely, 2^21357162057 is an apocalyptic number.

It is an amenable number.

21357162057 is a deficient number, since it is larger than the sum of its proper divisors (14544595383).

21357162057 is a wasteful number, since it uses less digits than its factorization.

21357162057 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1038933.

The product of its (nonzero) digits is 88200, while the sum is 39.

The spelling of 21357162057 in words is "twenty-one billion, three hundred fifty-seven million, one hundred sixty-two thousand, fifty-seven".