400893541421 has 2 divisors, whose sum is σ = 400893541422. Its totient is φ = 400893541420.

The previous prime is 400893541393. The next prime is 400893541429. The reversal of 400893541421 is 124145398004.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 310616728900 + 90276812521 = 557330^2 + 300461^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-400893541421 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (400893541429) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 200446770710 + 200446770711.

It is an arithmetic number, because the mean of its divisors is an integer number (200446770711).

Almost surely, 2^400893541421 is an apocalyptic number.

It is an amenable number.

400893541421 is a deficient number, since it is larger than the sum of its proper divisors (1).

400893541421 is an equidigital number, since it uses as much as digits as its factorization.

400893541421 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 138240, while the sum is 41.

The spelling of 400893541421 in words is "four hundred billion, eight hundred ninety-three million, five hundred forty-one thousand, four hundred twenty-one".