21799712 has 48 divisors (see below), whose sum is σ = 49587552. Its totient is φ = 9323520.

The previous prime is 21799711. The next prime is 21799747.

21799712 is nontrivially palindromic in base 10.

It is not an unprimeable number, because it can be changed into a prime (21799711) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4163 + ... + 7805.

It is an arithmetic number, because the mean of its divisors is an integer number (1033074).

Almost surely, 2^21799712 is an apocalyptic number.

21799712 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 21799712, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (24793776).

21799712 is an abundant number, since it is smaller than the sum of its proper divisors (27787840).

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

21799712 is a wasteful number, since it uses less digits than its factorization.

21799712 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3681 (or 3673 counting only the distinct ones).

The product of its digits is 15876, while the sum is 38.

The square root of 21799712 is about 4669.0161704582. The cubic root of 21799712 is about 279.3510139443.

The spelling of 21799712 in words is "twenty-one million, seven hundred ninety-nine thousand, seven hundred twelve".