521464166121 has 16 divisors (see below), whose sum is σ = 736893331200. Its totient is φ = 326878257408.

The previous prime is 521464166063. The next prime is 521464166147. The reversal of 521464166121 is 121661464125.

It is not a de Polignac number, because 521464166121 - 2⁷ = 521464165993 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 521464166121.

It is not an unprimeable number, because it can be changed into a prime (521464166161) 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, 4867506 + ... + 4973483.

It is an arithmetic number, because the mean of its divisors is an integer number (46055833200).

Almost surely, 2^521464166121 is an apocalyptic number.

521464166121 is a gapful number since it is divisible by the number (51) formed by its first and last digit.

It is an amenable number.

521464166121 is a deficient number, since it is larger than the sum of its proper divisors (215429165079).

521464166121 is a wasteful number, since it uses less digits than its factorization.

521464166121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9842048.

The product of its digits is 69120, while the sum is 39.

The spelling of 521464166121 in words is "five hundred twenty-one billion, four hundred sixty-four million, one hundred sixty-six thousand, one hundred twenty-one".