12021546520 has 32 divisors (see below), whose sum is σ = 27220777200. Its totient is φ = 4777987968.

The previous prime is 12021546503. The next prime is 12021546521. The reversal of 12021546520 is 2564512021.

It is a super-2 number, since 2×12021546520² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12021546521) 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, 950850 + ... + 963409.

Almost surely, 2^12021546520 is an apocalyptic number.

12021546520 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

12021546520 is an abundant number, since it is smaller than the sum of its proper divisors (15199230680).

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

12021546520 is a wasteful number, since it uses less digits than its factorization.

12021546520 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1914427 (or 1914423 counting only the distinct ones).

The product of its (nonzero) digits is 4800, while the sum is 28.

The spelling of 12021546520 in words is "twelve billion, twenty-one million, five hundred forty-six thousand, five hundred twenty".