400411647421 has 2 divisors, whose sum is σ = 400411647422. Its totient is φ = 400411647420.

The previous prime is 400411647413. The next prime is 400411647439. The reversal of 400411647421 is 124746114004.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 390468765625 + 9942881796 = 624875^2 + 99714^2 .

It is a cyclic number.

It is not a de Polignac number, because 400411647421 - 2³ = 400411647413 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (400411647221) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 200205823710 + 200205823711.

It is an arithmetic number, because the mean of its divisors is an integer number (200205823711).

Almost surely, 2^400411647421 is an apocalyptic number.

It is an amenable number.

400411647421 is a deficient number, since it is larger than the sum of its proper divisors (1).

400411647421 is an equidigital number, since it uses as much as digits as its factorization.

400411647421 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 21504, while the sum is 34.

The spelling of 400411647421 in words is "four hundred billion, four hundred eleven million, six hundred forty-seven thousand, four hundred twenty-one".