19890921132 has 36 divisors (see below), whose sum is σ = 50306758320. Its totient is φ = 6626755872.

The previous prime is 19890921121. The next prime is 19890921241. The reversal of 19890921132 is 23112909891.

It is a tau number, because it is divible by the number of its divisors (36).

It is a super-2 number, since 2×19890921132² (a number of 21 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 79383 + ... + 214670.

Almost surely, 2^19890921132 is an apocalyptic number.

19890921132 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

19890921132 is an abundant number, since it is smaller than the sum of its proper divisors (30415837188).

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

19890921132 is a wasteful number, since it uses less digits than its factorization.

19890921132 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 295942 (or 295937 counting only the distinct ones).

The product of its (nonzero) digits is 69984, while the sum is 45.

The spelling of 19890921132 in words is "nineteen billion, eight hundred ninety million, nine hundred twenty-one thousand, one hundred thirty-two".