12021148881 has 81 divisors (see below), whose sum is σ = 21208621161. Its totient is φ = 6541620624.

The previous prime is 12021148829. The next prime is 12021148939. The reversal of 12021148881 is 18884112021.

The square root of 12021148881 is 109641.

It is a perfect power (a square), and thus also a powerful number.

It is not a de Polignac number, because 12021148881 - 2⁷ = 12021148753 is a prime.

It is a super-2 number, since 2×12021148881² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (12021148801) by changing a digit.

It is a polite number, since it can be written in 80 ways as a sum of consecutive naturals, for example, 52956490 + ... + 52956716.

Almost surely, 2^12021148881 is an apocalyptic number.

12021148881 is the 109641-st square number.

12021148881 is the 54821-st centered octagonal number.

It is an amenable number.

12021148881 is a deficient number, since it is larger than the sum of its proper divisors (9187472280).

12021148881 is an equidigital number, since it uses as much as digits as its factorization.

12021148881 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 520 (or 260 counting only the distinct ones).

The product of its (nonzero) digits is 8192, while the sum is 36.

Multiplying 12021148881 by its sum of digits (36), we get a square (432761359716 = 657846²).

The spelling of 12021148881 in words is "twelve billion, twenty-one million, one hundred forty-eight thousand, eight hundred eighty-one".