1921312131192 has 48 divisors (see below), whose sum is σ = 5203969485000. Its totient is φ = 640386202176.

The previous prime is 1921312131161. The next prime is 1921312131247. The reversal of 1921312131192 is 2911312131291.

1921312131192 is a `hidden beast` number, since 1 + 9 + 21 + 312 + 1 + 311 + 9 + 2 = 666.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a nude number because it is divisible by every one of its digits.

It is a congruent number.

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, 153442 + ... + 1966257.

Almost surely, 2^{1921312131192} is an apocalyptic number.

1921312131192 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

1921312131192 is an abundant number, since it is smaller than the sum of its proper divisors (3282657353808).

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

1921312131192 is a wasteful number, since it uses less digits than its factorization.

1921312131192 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2132300 (or 2132293 counting only the distinct ones).

The product of its digits is 5832, while the sum is 36.

Subtracting 1921312131192 from its reverse (2911312131291), we obtain a palindrome (990000000099).

The spelling of 1921312131192 in words is "one trillion, nine hundred twenty-one billion, three hundred twelve million, one hundred thirty-one thousand, one hundred ninety-two".