9912211312 has 20 divisors (see below), whose sum is σ = 19824423616. Its totient is φ = 4796231040.

The previous prime is 9912211303. The next prime is 9912211313. The reversal of 9912211312 is 2131122199.

9912211312 is an admirable number.

It is a super-2 number, since 2×9912211312² (a number of 21 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (31).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (9912211313) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9991653 + ... + 9992644.

Almost surely, 2^9912211312 is an apocalyptic number.

It is an amenable number.

9912211312 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

9912211312 is a wasteful number, since it uses less digits than its factorization.

9912211312 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19984336 (or 19984330 counting only the distinct ones).

The product of its digits is 1944, while the sum is 31.

The square root of 9912211312 is about 99560.0889513464. The cubic root of 9912211312 is about 2148.1116509048. Note that the first 3 decimals are identical.

The spelling of 9912211312 in words is "nine billion, nine hundred twelve million, two hundred eleven thousand, three hundred twelve".