121001002001988 has 48 divisors (see below), whose sum is σ = 289238565872256. Its totient is φ = 39347652867840.

The previous prime is 121001002001987. The next prime is 121001002002079. The reversal of 121001002001988 is 889100200100121.

It is not an unprimeable number, because it can be changed into a prime (121001002001981) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1478370 + ... + 15626502.

It is an arithmetic number, because the mean of its divisors is an integer number (6025803455672).

Almost surely, 2^{121001002001988} is an apocalyptic number.

It is an amenable number.

121001002001988 is an abundant number, since it is smaller than the sum of its proper divisors (168237563870268).

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

121001002001988 is a wasteful number, since it uses less digits than its factorization.

121001002001988 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14165564 (or 14165562 counting only the distinct ones).

The product of its (nonzero) digits is 2304, while the sum is 33.

The spelling of 121001002001988 in words is "one hundred twenty-one trillion, one billion, two million, one thousand, nine hundred eighty-eight".