21223431134 has 4 divisors (see below), whose sum is σ = 31835146704. Its totient is φ = 10611715566.

The previous prime is 21223431083. The next prime is 21223431149. The reversal of 21223431134 is 43113432212.

It is a semiprime because it is the product of two primes.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5305857782 + ... + 5305857785.

It is an arithmetic number, because the mean of its divisors is an integer number (7958786676).

Almost surely, 2^21223431134 is an apocalyptic number.

21223431134 is a deficient number, since it is larger than the sum of its proper divisors (10611715570).

21223431134 is a wasteful number, since it uses less digits than its factorization.

21223431134 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10611715569.

The product of its digits is 3456, while the sum is 26.

Adding to 21223431134 its reverse (43113432212), we get a palindrome (64336863346).

The spelling of 21223431134 in words is "twenty-one billion, two hundred twenty-three million, four hundred thirty-one thousand, one hundred thirty-four".