21127792 has 80 divisors (see below), whose sum is σ = 49496832. Its totient is φ = 8547840.

The previous prime is 21127783. The next prime is 21127817. The reversal of 21127792 is 29772112.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 197403 + ... + 197509.

Almost surely, 2^21127792 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 21127792, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (24748416).

21127792 is an abundant number, since it is smaller than the sum of its proper divisors (28369040).

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

21127792 is a wasteful number, since it uses less digits than its factorization.

21127792 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 206 (or 200 counting only the distinct ones).

The product of its digits is 3528, while the sum is 31.

The square root of 21127792 is about 4596.4977972365. The cubic root of 21127792 is about 276.4509187189.

The spelling of 21127792 in words is "twenty-one million, one hundred twenty-seven thousand, seven hundred ninety-two".