21312233122 has 4 divisors (see below), whose sum is σ = 31968349686. Its totient is φ = 10656116560.

The previous prime is 21312233069. The next prime is 21312233203. The reversal of 21312233122 is 22133221312.

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

It can be written as a sum of positive squares in only one way, i.e., 19463319121 + 1848914001 = 139511^2 + 42999^2 .

It is a super-2 number, since 2×21312233122² (a number of 21 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 21312233093 and 21312233102.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5328058279 + ... + 5328058282.

Almost surely, 2^21312233122 is an apocalyptic number.

21312233122 is a deficient number, since it is larger than the sum of its proper divisors (10656116564).

21312233122 is a wasteful number, since it uses less digits than its factorization.

21312233122 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10656116563.

The product of its digits is 864, while the sum is 22.

Adding to 21312233122 its reverse (22133221312), we get a palindrome (43445454434).

The spelling of 21312233122 in words is "twenty-one billion, three hundred twelve million, two hundred thirty-three thousand, one hundred twenty-two".