1990121210232 has 32 divisors (see below), whose sum is σ = 5109770677200. Its totient is φ = 645444716544.

The previous prime is 1990121210221. The next prime is 1990121210237. The reversal of 1990121210232 is 2320121210991.

It is a junction number, because it is equal to n+sod(n) for n = 1990121210193 and 1990121210202.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1990121210237) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1120562857 + ... + 1120564632.

Almost surely, 2^{1990121210232} is an apocalyptic number.

1990121210232 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

1990121210232 is an abundant number, since it is smaller than the sum of its proper divisors (3119649466968).

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

1990121210232 is a wasteful number, since it uses less digits than its factorization.

1990121210232 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2241127535 (or 2241127531 counting only the distinct ones).

The product of its (nonzero) digits is 3888, while the sum is 33.

Multiplying 1990121210232 by its sum of digits (33), we get a palindrome (65673999937656).

The spelling of 1990121210232 in words is "one trillion, nine hundred ninety billion, one hundred twenty-one million, two hundred ten thousand, two hundred thirty-two".