12021564212 has 72 divisors (see below), whose sum is σ = 25768607424. Its totient is φ = 4805756928.

The previous prime is 12021564197. The next prime is 12021564227. The reversal of 12021564212 is 21246512021.

It is an interprime number because it is at equal distance from previous prime (12021564197) and next prime (12021564227).

It is a super-2 number, since 2×12021564212² (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 23 ways as a sum of consecutive naturals, for example, 907823 + ... + 920969.

Almost surely, 2^12021564212 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 12021564212, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (12884303712).

12021564212 is an abundant number, since it is smaller than the sum of its proper divisors (13747043212).

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

12021564212 is a wasteful number, since it uses less digits than its factorization.

12021564212 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13305 (or 13286 counting only the distinct ones).

The product of its (nonzero) digits is 1920, while the sum is 26.

The spelling of 12021564212 in words is "twelve billion, twenty-one million, five hundred sixty-four thousand, two hundred twelve".