521454321 has 32 divisors (see below), whose sum is σ = 808704000. Its totient is φ = 331453584.

The previous prime is 521454319. The next prime is 521454343. The reversal of 521454321 is 123454125.

It is not a de Polignac number, because 521454321 - 2¹ = 521454319 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

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

It is not an unprimeable number, because it can be changed into a prime (521454301) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 221770 + ... + 224108.

It is an arithmetic number, because the mean of its divisors is an integer number (25272000).

Almost surely, 2^521454321 is an apocalyptic number.

It is an amenable number.

521454321 is a deficient number, since it is larger than the sum of its proper divisors (287249679).

521454321 is a wasteful number, since it uses less digits than its factorization.

521454321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2730 (or 2724 counting only the distinct ones).

The product of its digits is 4800, while the sum is 27.

The square root of 521454321 is about 22835.3743345714. The cubic root of 521454321 is about 804.8941239045.

The spelling of 521454321 in words is "five hundred twenty-one million, four hundred fifty-four thousand, three hundred twenty-one".