21057759094965 has 32 divisors (see below), whose sum is σ = 34601118644736. Its totient is φ = 10929283453440.

The previous prime is 21057759094963. The next prime is 21057759094979. The reversal of 21057759094965 is 56949095775012.

It is not a de Polignac number, because 21057759094965 - 2¹ = 21057759094963 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 21057759094965.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21057759094963) 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, 42879597 + ... + 43367906.

It is an arithmetic number, because the mean of its divisors is an integer number (1081284957648).

Almost surely, 2^{21057759094965} is an apocalyptic number.

It is an amenable number.

21057759094965 is a deficient number, since it is larger than the sum of its proper divisors (13543359549771).

21057759094965 is a wasteful number, since it uses less digits than its factorization.

21057759094965 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 86247949.

The product of its (nonzero) digits is 214326000, while the sum is 69.

The spelling of 21057759094965 in words is "twenty-one trillion, fifty-seven billion, seven hundred fifty-nine million, ninety-four thousand, nine hundred sixty-five".