21231231192 has 64 divisors (see below), whose sum is σ = 59129856000. Its totient is φ = 7058571552.

The previous prime is 21231231191. The next prime is 21231231193. The reversal of 21231231192 is 29113213212.

21231231192 is a `hidden beast` number, since 212 + 31 + 231 + 192 = 666.

It is an interprime number because it is at equal distance from previous prime (21231231191) and next prime (21231231193).

It is a Harshad number since it is a multiple of its sum of digits (27).

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21231231191) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 45592 + ... + 211047.

It is an arithmetic number, because the mean of its divisors is an integer number (923904000).

Almost surely, 2^21231231192 is an apocalyptic number.

It is an amenable number.

21231231192 is an abundant number, since it is smaller than the sum of its proper divisors (37898624808).

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

21231231192 is a wasteful number, since it uses less digits than its factorization.

21231231192 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 257037 (or 257027 counting only the distinct ones).

The product of its digits is 1296, while the sum is 27.

The spelling of 21231231192 in words is "twenty-one billion, two hundred thirty-one million, two hundred thirty-one thousand, one hundred ninety-two".