21231286092 has 18 divisors (see below), whose sum is σ = 53667973268. Its totient is φ = 7077095352.

The previous prime is 21231286079. The next prime is 21231286093. The reversal of 21231286092 is 29068213212.

It is a happy number.

21231286092 is a `hidden beast` number, since 2 + 1 + 23 + 1 + 28 + 609 + 2 = 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: 589757947 = 21231286092 / (2 + 1 + 2 + 3 + 1 + 2 + 8 + 6 + 0 + 9 + 2).

It is not an unprimeable number, because it can be changed into a prime (21231286093) 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, 294878938 + ... + 294879009.

Almost surely, 2^21231286092 is an apocalyptic number.

It is an amenable number.

21231286092 is an abundant number, since it is smaller than the sum of its proper divisors (32436687176).

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

21231286092 is a wasteful number, since it uses less digits than its factorization.

21231286092 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 589757957 (or 589757952 counting only the distinct ones).

The product of its (nonzero) digits is 20736, while the sum is 36.

The spelling of 21231286092 in words is "twenty-one billion, two hundred thirty-one million, two hundred eighty-six thousand, ninety-two".