521320401401 has 4 divisors (see below), whose sum is σ = 522964945572. Its totient is φ = 519675857232.

The previous prime is 521320401391. The next prime is 521320401403. The reversal of 521320401401 is 104104023125.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 18247957225 + 503072444176 = 135085^2 + 709276^2 .

It is a cyclic number.

It is not a de Polignac number, because 521320401401 - 2²⁶ = 521253292537 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (521320401403) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 822271610 + ... + 822272243.

It is an arithmetic number, because the mean of its divisors is an integer number (130741236393).

Almost surely, 2^521320401401 is an apocalyptic number.

It is an amenable number.

521320401401 is a deficient number, since it is larger than the sum of its proper divisors (1644544171).

521320401401 is a wasteful number, since it uses less digits than its factorization.

521320401401 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1644544170.

The product of its (nonzero) digits is 960, while the sum is 23.

Adding to 521320401401 its reverse (104104023125), we get a palindrome (625424424526).

The spelling of 521320401401 in words is "five hundred twenty-one billion, three hundred twenty million, four hundred one thousand, four hundred one".