21937543185657 has 16 divisors (see below), whose sum is σ = 31909682092032. Its totient is φ = 13295260565520.

The previous prime is 21937543185643. The next prime is 21937543185673. The reversal of 21937543185657 is 75658134573912.

It is not a de Polignac number, because 21937543185657 - 2¹⁶ = 21937543120121 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21937543185637) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3469473 + ... + 7477454.

It is an arithmetic number, because the mean of its divisors is an integer number (1994355130752).

Almost surely, 2^{21937543185657} is an apocalyptic number.

It is an amenable number.

21937543185657 is a deficient number, since it is larger than the sum of its proper divisors (9972138906375).

21937543185657 is a wasteful number, since it uses less digits than its factorization.

21937543185657 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11007668.

The product of its digits is 190512000, while the sum is 66.

The spelling of 21937543185657 in words is "twenty-one trillion, nine hundred thirty-seven billion, five hundred forty-three million, one hundred eighty-five thousand, six hundred fifty-seven".