1002001121992 has 32 divisors (see below), whose sum is σ = 2025364017600. Its totient is φ = 461983765824.

The previous prime is 1002001121987. The next prime is 1002001122079. The reversal of 1002001121992 is 2991211002001.

It is a self number, because there is not a number n which added to its sum of digits gives 1002001121992.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4881142 + ... + 5082277.

It is an arithmetic number, because the mean of its divisors is an integer number (63292625550).

Almost surely, 2^{1002001121992} is an apocalyptic number.

It is an amenable number.

1002001121992 is an abundant number, since it is smaller than the sum of its proper divisors (1023362895608).

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

1002001121992 is a wasteful number, since it uses less digits than its factorization.

1002001121992 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9964405 (or 9964401 counting only the distinct ones).

The product of its (nonzero) digits is 648, while the sum is 28.

Adding to 1002001121992 its reverse (2991211002001), we get a palindrome (3993212123993).

The spelling of 1002001121992 in words is "one trillion, two billion, one million, one hundred twenty-one thousand, nine hundred ninety-two".