1021000121988 has 96 divisors (see below), whose sum is σ = 2990116684800. Its totient is φ = 263414970240.

The previous prime is 1021000121971. The next prime is 1021000122001. The reversal of 1021000121988 is 8891210001201.

It is a Harshad number since it is a multiple of its sum of digits (33).

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 3570306 + ... + 3845657.

It is an arithmetic number, because the mean of its divisors is an integer number (31147048800).

Almost surely, 2^{1021000121988} is an apocalyptic number.

It is an amenable number.

1021000121988 is an abundant number, since it is smaller than the sum of its proper divisors (1969116562812).

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

1021000121988 is a wasteful number, since it uses less digits than its factorization.

1021000121988 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7416137 (or 7416135 counting only the distinct ones).

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

The spelling of 1021000121988 in words is "one trillion, twenty-one billion, one hundred twenty-one thousand, nine hundred eighty-eight".