1001221201992 has 64 divisors (see below), whose sum is σ = 2732515156800. Its totient is φ = 303187933440.

The previous prime is 1001221201987. The next prime is 1001221202011. The reversal of 1001221201992 is 2991021221001.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 949723 + ... + 1704234.

It is an arithmetic number, because the mean of its divisors is an integer number (42695549325).

Almost surely, 2^{1001221201992} is an apocalyptic number.

1001221201992 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

1001221201992 is an abundant number, since it is smaller than the sum of its proper divisors (1731293954808).

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

1001221201992 is a wasteful number, since it uses less digits than its factorization.

1001221201992 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2655406 (or 2655402 counting only the distinct ones).

The product of its (nonzero) digits is 1296, while the sum is 30.

Adding to 1001221201992 its reverse (2991021221001), we get a palindrome (3992242422993).

The spelling of 1001221201992 in words is "one trillion, one billion, two hundred twenty-one million, two hundred one thousand, nine hundred ninety-two".