401413215521 has 2 divisors, whose sum is σ = 401413215522. Its totient is φ = 401413215520.

The previous prime is 401413215487. The next prime is 401413215571. The reversal of 401413215521 is 125512314104.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 366673847296 + 34739368225 = 605536^2 + 186385^2 .

It is a cyclic number.

It is not a de Polignac number, because 401413215521 - 2⁶ = 401413215457 is a prime.

It is a super-2 number, since 2×401413215521² (a number of 24 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (401413215571) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 200706607760 + 200706607761.

It is an arithmetic number, because the mean of its divisors is an integer number (200706607761).

Almost surely, 2^401413215521 is an apocalyptic number.

It is an amenable number.

401413215521 is a deficient number, since it is larger than the sum of its proper divisors (1).

401413215521 is an equidigital number, since it uses as much as digits as its factorization.

401413215521 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4800, while the sum is 29.

Adding to 401413215521 its reverse (125512314104), we get a palindrome (526925529625).

The spelling of 401413215521 in words is "four hundred one billion, four hundred thirteen million, two hundred fifteen thousand, five hundred twenty-one".