400012211122 has 24 divisors (see below), whose sum is σ = 637598887380. Its totient is φ = 188179261440.

The previous prime is 400012211089. The next prime is 400012211161. The reversal of 400012211122 is 221112210004.

It can be written as a sum of positive squares in 6 ways, for example, as 368338534281 + 31673676841 = 606909^2 + 177971^2 .

It is a junction number, because it is equal to n+sod(n) for n = 400012211096 and 400012211105.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1673422 + ... + 1897462.

Almost surely, 2^400012211122 is an apocalyptic number.

400012211122 is a deficient number, since it is larger than the sum of its proper divisors (237586676258).

400012211122 is a wasteful number, since it uses less digits than its factorization.

400012211122 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 227166 (or 227149 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 16.

Adding to 400012211122 its reverse (221112210004), we get a palindrome (621124421126).

The spelling of 400012211122 in words is "four hundred billion, twelve million, two hundred eleven thousand, one hundred twenty-two".