401320540521 has 32 divisors (see below), whose sum is σ = 596053529600. Its totient is φ = 266870764800.

The previous prime is 401320540459. The next prime is 401320540571. The reversal of 401320540521 is 125045023104.

401320540521 is a `hidden beast` number, since 4 + 0 + 132 + 0 + 5 + 4 + 0 + 521 = 666.

It is not a de Polignac number, because 401320540521 - 2²² = 401316346217 is a prime.

It is a super-2 number, since 2×401320540521² (a number of 24 digits) contains 22 as substring.

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

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (401320540571) 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, 19672995 + ... + 19693383.

It is an arithmetic number, because the mean of its divisors is an integer number (18626672800).

Almost surely, 2^401320540521 is an apocalyptic number.

It is an amenable number.

401320540521 is a deficient number, since it is larger than the sum of its proper divisors (194732989079).

401320540521 is a wasteful number, since it uses less digits than its factorization.

401320540521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22206 (or 22200 counting only the distinct ones).

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

Adding to 401320540521 its reverse (125045023104), we get a palindrome (526365563625).

The spelling of 401320540521 in words is "four hundred one billion, three hundred twenty million, five hundred forty thousand, five hundred twenty-one".