521450121 has 8 divisors (see below), whose sum is σ = 711436000. Its totient is φ = 339548832.

The previous prime is 521450113. The next prime is 521450123. The reversal of 521450121 is 121054125.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 521450121 - 2³ = 521450113 is a prime.

It is a super-3 number, since 3×521450121³ (a number of 27 digits) contains 333 as substring.

It is an alternating number because its digits alternate between odd and even.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (521450123) 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, 2020996 + ... + 2021253.

It is an arithmetic number, because the mean of its divisors is an integer number (88929500).

Almost surely, 2^521450121 is an apocalyptic number.

It is an amenable number.

521450121 is a deficient number, since it is larger than the sum of its proper divisors (189985879).

521450121 is a wasteful number, since it uses less digits than its factorization.

521450121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4042295.

The product of its (nonzero) digits is 400, while the sum is 21.

The square root of 521450121 is about 22835.2823718035. The cubic root of 521450121 is about 804.8919629198.

The spelling of 521450121 in words is "five hundred twenty-one million, four hundred fifty thousand, one hundred twenty-one".