21354427192 has 128 divisors (see below), whose sum is σ = 49069670400. Its totient is φ = 8504358912.

The previous prime is 21354427187. The next prime is 21354427207. The reversal of 21354427192 is 29172445312.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 41953434 + ... + 41953942.

It is an arithmetic number, because the mean of its divisors is an integer number (383356800).

Almost surely, 2^21354427192 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21354427192, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (24534835200).

21354427192 is an abundant number, since it is smaller than the sum of its proper divisors (27715243208).

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

21354427192 is a wasteful number, since it uses less digits than its factorization.

21354427192 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1013 (or 1009 counting only the distinct ones).

The product of its digits is 120960, while the sum is 40.

The spelling of 21354427192 in words is "twenty-one billion, three hundred fifty-four million, four hundred twenty-seven thousand, one hundred ninety-two".