12021111988 has 6 divisors (see below), whose sum is σ = 21036945986. Its totient is φ = 6010555992.

The previous prime is 12021111953. The next prime is 12021111997. The reversal of 12021111988 is 88911112021.

It can be written as a sum of positive squares in only one way, i.e., 12020491044 + 620944 = 109638^2 + 788^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1502638995 + ... + 1502639002.

Almost surely, 2^12021111988 is an apocalyptic number.

It is an amenable number.

12021111988 is a deficient number, since it is larger than the sum of its proper divisors (9015833998).

12021111988 is a wasteful number, since it uses less digits than its factorization.

12021111988 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3005278001 (or 3005277999 counting only the distinct ones).

The product of its (nonzero) digits is 2304, while the sum is 34.

The spelling of 12021111988 in words is "twelve billion, twenty-one million, one hundred eleven thousand, nine hundred eighty-eight".