12210400442 has 16 divisors (see below), whose sum is σ = 18738649512. Its totient is φ = 5965140480.

The previous prime is 12210400393. The next prime is 12210400453. The reversal of 12210400442 is 24400401221.

It can be written as a sum of positive squares in 4 ways, for example, as 9763218481 + 2447181961 = 98809^2 + 49469^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 213443 + ... + 264534.

Almost surely, 2^12210400442 is an apocalyptic number.

12210400442 is a deficient number, since it is larger than the sum of its proper divisors (6528249070).

12210400442 is a wasteful number, since it uses less digits than its factorization.

12210400442 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 478273.

The product of its (nonzero) digits is 512, while the sum is 20.

Adding to 12210400442 its reverse (24400401221), we get a palindrome (36610801663).

The spelling of 12210400442 in words is "twelve billion, two hundred ten million, four hundred thousand, four hundred forty-two".