12121011988 has 6 divisors (see below), whose sum is σ = 21211770986. Its totient is φ = 6060505992.

The previous prime is 12121011971. The next prime is 12121011989. The reversal of 12121011988 is 88911012121.

It can be written as a sum of positive squares in only one way, i.e., 10782330244 + 1338681744 = 103838^2 + 36588^2 .

It is a super-2 number, since 2×12121011988² (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 (12121011989) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1515126495 + ... + 1515126502.

Almost surely, 2^12121011988 is an apocalyptic number.

It is an amenable number.

12121011988 is a deficient number, since it is larger than the sum of its proper divisors (9090758998).

12121011988 is a wasteful number, since it uses less digits than its factorization.

12121011988 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3030253001 (or 3030252999 counting only the distinct ones).

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

The spelling of 12121011988 in words is "twelve billion, one hundred twenty-one million, eleven thousand, nine hundred eighty-eight".