400031221111 has 2 divisors, whose sum is σ = 400031221112. Its totient is φ = 400031221110.

The previous prime is 400031221103. The next prime is 400031221133. The reversal of 400031221111 is 111122130004.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 400031221111 - 2³ = 400031221103 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (400031221211) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 200015610555 + 200015610556.

It is an arithmetic number, because the mean of its divisors is an integer number (200015610556).

Almost surely, 2^400031221111 is an apocalyptic number.

400031221111 is a deficient number, since it is larger than the sum of its proper divisors (1).

400031221111 is an equidigital number, since it uses as much as digits as its factorization.

400031221111 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 48, while the sum is 16.

Adding to 400031221111 its reverse (111122130004), we get a palindrome (511153351115).

The spelling of 400031221111 in words is "four hundred billion, thirty-one million, two hundred twenty-one thousand, one hundred eleven".