21312232022 has 16 divisors (see below), whose sum is σ = 32733372672. Its totient is φ = 10404022440.

The previous prime is 21312232021. The next prime is 21312232063. The reversal of 21312232022 is 22023221312.

It is a happy number.

It is a super-2 number, since 2×21312232022² (a number of 21 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 21312231985 and 21312232003.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21312232021) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 713948 + ... + 743199.

It is an arithmetic number, because the mean of its divisors is an integer number (2045835792).

Almost surely, 2^21312232022 is an apocalyptic number.

21312232022 is a deficient number, since it is larger than the sum of its proper divisors (11421140650).

21312232022 is a wasteful number, since it uses less digits than its factorization.

21312232022 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1457323.

The product of its (nonzero) digits is 576, while the sum is 20.

Adding to 21312232022 its reverse (22023221312), we get a palindrome (43335453334).

The spelling of 21312232022 in words is "twenty-one billion, three hundred twelve million, two hundred thirty-two thousand, twenty-two".