521045421 has 12 divisors (see below), whose sum is σ = 752279328. Its totient is φ = 320643024.

The previous prime is 521045411. The next prime is 521045423. The reversal of 521045421 is 124540125.

It is not a de Polignac number, because 521045421 - 2⁷ = 521045293 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 521045391 and 521045400.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (521045423) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 513345 + ... + 514358.

It is an arithmetic number, because the mean of its divisors is an integer number (62689944).

Almost surely, 2^521045421 is an apocalyptic number.

It is an amenable number.

521045421 is a deficient number, since it is larger than the sum of its proper divisors (231233907).

521045421 is a wasteful number, since it uses less digits than its factorization.

521045421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1027732 (or 1027719 counting only the distinct ones).

The product of its (nonzero) digits is 1600, while the sum is 24.

The square root of 521045421 is about 22826.4193644119. The cubic root of 521045421 is about 804.6836821594.

Adding to 521045421 its reverse (124540125), we get a palindrome (645585546).

The spelling of 521045421 in words is "five hundred twenty-one million, forty-five thousand, four hundred twenty-one".