21872792 has 8 divisors (see below), whose sum is σ = 41011500. Its totient is φ = 10936392.

The previous prime is 21872789. The next prime is 21872797. The reversal of 21872792 is 29727812.

It is a tau number, because it is divible by the number of its divisors (8).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21872797) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1367042 + ... + 1367057.

Almost surely, 2^21872792 is an apocalyptic number.

It is an amenable number.

21872792 is a deficient number, since it is larger than the sum of its proper divisors (19138708).

21872792 is a wasteful number, since it uses less digits than its factorization.

21872792 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2734105 (or 2734101 counting only the distinct ones).

The product of its digits is 28224, while the sum is 38.

The square root of 21872792 is about 4676.8356823818. The cubic root of 21872792 is about 279.6628254316.

The spelling of 21872792 in words is "twenty-one million, eight hundred seventy-two thousand, seven hundred ninety-two".