21312023122 has 16 divisors (see below), whose sum is σ = 35266801752. Its totient is φ = 9596407680.

The previous prime is 21312023111. The next prime is 21312023141. The reversal of 21312023122 is 22132021312.

It can be written as a sum of positive squares in 4 ways, for example, as 14964873561 + 6347149561 = 122331^2 + 79669^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 21312023122.

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, 9995193 + ... + 9997324.

Almost surely, 2^21312023122 is an apocalyptic number.

21312023122 is a deficient number, since it is larger than the sum of its proper divisors (13954778630).

21312023122 is a wasteful number, since it uses less digits than its factorization.

21312023122 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19992573.

The product of its (nonzero) digits is 288, while the sum is 19.

Adding to 21312023122 its reverse (22132021312), we get a palindrome (43444044434).

The spelling of 21312023122 in words is "twenty-one billion, three hundred twelve million, twenty-three thousand, one hundred twenty-two".