21122120312 has 16 divisors (see below), whose sum is σ = 39624017400. Its totient is φ = 10555715680.

The previous prime is 21122120297. The next prime is 21122120381. The reversal of 21122120312 is 21302122112.

It is a super-2 number, since 2×21122120312² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 651239 + ... + 682902.

Almost surely, 2^21122120312 is an apocalyptic number.

It is an amenable number.

21122120312 is a deficient number, since it is larger than the sum of its proper divisors (18501897088).

21122120312 is a wasteful number, since it uses less digits than its factorization.

21122120312 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1336126 (or 1336122 counting only the distinct ones).

The product of its (nonzero) digits is 96, while the sum is 17.

Adding to 21122120312 its reverse (21302122112), we get a palindrome (42424242424).

The spelling of 21122120312 in words is "twenty-one billion, one hundred twenty-two million, one hundred twenty thousand, three hundred twelve".