11921340492 has 18 divisors (see below), whose sum is σ = 30134499668. Its totient is φ = 3973780152.

The previous prime is 11921340461. The next prime is 11921340499. The reversal of 11921340492 is 29404312911.

11921340492 is a `hidden beast` number, since 119 + 2 + 13 + 40 + 492 = 666.

It is a tau number, because it is divible by the number of its divisors (18).

It is a Harshad number since it is a multiple of its sum of digits (36), and also a Moran number because the ratio is a prime number: 331148347 = 11921340492 / (1 + 1 + 9 + 2 + 1 + 3 + 4 + 0 + 4 + 9 + 2).

It is not an unprimeable number, because it can be changed into a prime (11921340499) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 165574138 + ... + 165574209.

Almost surely, 2^11921340492 is an apocalyptic number.

11921340492 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

11921340492 is an abundant number, since it is smaller than the sum of its proper divisors (18213159176).

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

11921340492 is a wasteful number, since it uses less digits than its factorization.

11921340492 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 331148357 (or 331148352 counting only the distinct ones).

The product of its (nonzero) digits is 15552, while the sum is 36.

The spelling of 11921340492 in words is "eleven billion, nine hundred twenty-one million, three hundred forty thousand, four hundred ninety-two".