401515626221 has 2 divisors, whose sum is σ = 401515626222. Its totient is φ = 401515626220.

The previous prime is 401515626191. The next prime is 401515626283. The reversal of 401515626221 is 122626515104.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 230413440196 + 171102186025 = 480014^2 + 413645^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-401515626221 is a prime.

It is a super-2 number, since 2×401515626221² (a number of 24 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (401515626121) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 200757813110 + 200757813111.

It is an arithmetic number, because the mean of its divisors is an integer number (200757813111).

Almost surely, 2^401515626221 is an apocalyptic number.

It is an amenable number.

401515626221 is a deficient number, since it is larger than the sum of its proper divisors (1).

401515626221 is an equidigital number, since it uses as much as digits as its factorization.

401515626221 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 28800, while the sum is 35.

The spelling of 401515626221 in words is "four hundred one billion, five hundred fifteen million, six hundred twenty-six thousand, two hundred twenty-one".