21769792 has 84 divisors (see below), whose sum is σ = 50529744. Its totient is φ = 9226240.

The previous prime is 21769757. The next prime is 21769817. The reversal of 21769792 is 29796712.

21769792 is a modest number, since divided by 9792 gives 2176 as remainder.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 203403 + ... + 203509.

Almost surely, 2^21769792 is an apocalyptic number.

21769792 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21769792, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (25264872).

21769792 is an abundant number, since it is smaller than the sum of its proper divisors (28759952).

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

21769792 is a wasteful number, since it uses less digits than its factorization.

21769792 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 164 (or 137 counting only the distinct ones).

The product of its digits is 95256, while the sum is 43.

The square root of 21769792 is about 4665.8109691671. The cubic root of 21769792 is about 279.2231527886.

The spelling of 21769792 in words is "twenty-one million, seven hundred sixty-nine thousand, seven hundred ninety-two".