521030121 has 16 divisors (see below), whose sum is σ = 719824320. Its totient is φ = 335017280.

The previous prime is 521030117. The next prime is 521030171. The reversal of 521030121 is 121030125.

It is a cyclic number.

It is not a de Polignac number, because 521030121 - 2² = 521030117 is a prime.

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

It is a self number, because there is not a number n which added to its sum of digits gives 521030121.

It is not an unprimeable number, because it can be changed into a prime (521030171) 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, 18390 + ... + 37151.

It is an arithmetic number, because the mean of its divisors is an integer number (44989020).

Almost surely, 2^521030121 is an apocalyptic number.

It is an amenable number.

521030121 is a deficient number, since it is larger than the sum of its proper divisors (198794199).

521030121 is a wasteful number, since it uses less digits than its factorization.

521030121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 55656.

The product of its (nonzero) digits is 60, while the sum is 15.

The square root of 521030121 is about 22826.0842239750. The cubic root of 521030121 is about 804.6758058270.

Adding to 521030121 its reverse (121030125), we get a palindrome (642060246).

The spelling of 521030121 in words is "five hundred twenty-one million, thirty thousand, one hundred twenty-one".