11457857617921 has 32 divisors (see below), whose sum is σ = 13925695633920. Its totient is φ = 9283071302400.

The previous prime is 11457857617903. The next prime is 11457857617933. The reversal of 11457857617921 is 12971675875411.

It is a cyclic number.

It is not a de Polignac number, because 11457857617921 - 2⁷ = 11457857617793 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (11457857657921) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 172569096 + ... + 172635478.

It is an arithmetic number, because the mean of its divisors is an integer number (435177988560).

Almost surely, 2^{11457857617921} is an apocalyptic number.

11457857617921 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

11457857617921 is a deficient number, since it is larger than the sum of its proper divisors (2467838015999).

11457857617921 is a wasteful number, since it uses less digits than its factorization.

11457857617921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 108057.

The product of its digits is 29635200, while the sum is 64.

The spelling of 11457857617921 in words is "eleven trillion, four hundred fifty-seven billion, eight hundred fifty-seven million, six hundred seventeen thousand, nine hundred twenty-one".