521054721 has 32 divisors (see below), whose sum is σ = 847059840. Its totient is φ = 313934400.

The previous prime is 521054707. The next prime is 521054731. The reversal of 521054721 is 127450125.

It is not a de Polignac number, because 521054721 - 2⁷ = 521054593 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 a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (521054731) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 46311 + ... + 56451.

It is an arithmetic number, because the mean of its divisors is an integer number (26470620).

Almost surely, 2^521054721 is an apocalyptic number.

It is an amenable number.

521054721 is a deficient number, since it is larger than the sum of its proper divisors (326005119).

521054721 is a wasteful number, since it uses less digits than its factorization.

521054721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10334 (or 10328 counting only the distinct ones).

The product of its (nonzero) digits is 2800, while the sum is 27.

The square root of 521054721 is about 22826.6230748221. The cubic root of 521054721 is about 804.6884696587.

The spelling of 521054721 in words is "five hundred twenty-one million, fifty-four thousand, seven hundred twenty-one".