401905213121 has 2 divisors, whose sum is σ = 401905213122. Its totient is φ = 401905213120.

The previous prime is 401905213103. The next prime is 401905213189. The reversal of 401905213121 is 121312509104.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 401531332225 + 373880896 = 633665^2 + 19336^2 .

It is a cyclic number.

It is not a de Polignac number, because 401905213121 - 2¹⁰ = 401905212097 is a prime.

It is not a weakly prime, because it can be changed into another prime (401905243121) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 200952606560 + 200952606561.

It is an arithmetic number, because the mean of its divisors is an integer number (200952606561).

Almost surely, 2^401905213121 is an apocalyptic number.

It is an amenable number.

401905213121 is a deficient number, since it is larger than the sum of its proper divisors (1).

401905213121 is an equidigital number, since it uses as much as digits as its factorization.

401905213121 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2160, while the sum is 29.

The spelling of 401905213121 in words is "four hundred one billion, nine hundred five million, two hundred thirteen thousand, one hundred twenty-one".