21057759094966 has 16 divisors (see below), whose sum is σ = 34502960313360. Its totient is φ = 9559261716480.

The previous prime is 21057759094963. The next prime is 21057759094979. The reversal of 21057759094966 is 66949095775012.

It is a junction number, because it is equal to n+sod(n) for n = 21057759094895 and 21057759094904.

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 7 ways as a sum of consecutive naturals, for example, 622330851 + ... + 622364686.

It is an arithmetic number, because the mean of its divisors is an integer number (2156435019585).

Almost surely, 2^{21057759094966} is an apocalyptic number.

21057759094966 is a deficient number, since it is larger than the sum of its proper divisors (13445201218394).

21057759094966 is a wasteful number, since it uses less digits than its factorization.

21057759094966 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1244696319.

The product of its (nonzero) digits is 257191200, while the sum is 70.

The spelling of 21057759094966 in words is "twenty-one trillion, fifty-seven billion, seven hundred fifty-nine million, ninety-four thousand, nine hundred sixty-six".