22138406402 has 32 divisors (see below), whose sum is σ = 39187513344. Its totient is φ = 9179082000.

The previous prime is 22138406401. The next prime is 22138406449. The reversal of 22138406402 is 20460483122.

It is a super-2 number, since 2×22138406402² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (22138406401) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2143583 + ... + 2153885.

It is an arithmetic number, because the mean of its divisors is an integer number (1224609792).

Almost surely, 2^22138406402 is an apocalyptic number.

22138406402 is a deficient number, since it is larger than the sum of its proper divisors (17049106942).

22138406402 is a wasteful number, since it uses less digits than its factorization.

22138406402 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15294.

The product of its (nonzero) digits is 18432, while the sum is 32.

Adding to 22138406402 its reverse (20460483122), we get a palindrome (42598889524).

The spelling of 22138406402 in words is "twenty-two billion, one hundred thirty-eight million, four hundred six thousand, four hundred two".