21794724 has 96 divisors (see below), whose sum is σ = 65372160. Its totient is φ = 6150816.

The previous prime is 21794719. The next prime is 21794737. The reversal of 21794724 is 42749712.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a nude number because it is divisible by every one of its digits.

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, 95899 + ... + 96125.

It is an arithmetic number, because the mean of its divisors is an integer number (680960).

Almost surely, 2^21794724 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 21794724, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (32686080).

21794724 is an abundant number, since it is smaller than the sum of its proper divisors (43577436).

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

21794724 is a wasteful number, since it uses less digits than its factorization.

21794724 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 374 (or 366 counting only the distinct ones).

The product of its digits is 28224, while the sum is 36.

The square root of 21794724 is about 4668.4819802587. The cubic root of 21794724 is about 279.3297061835.

It can be divided in two parts, 2179 and 4724, that added together give a triangular number (6903 = T₁₁₇).

The spelling of 21794724 in words is "twenty-one million, seven hundred ninety-four thousand, seven hundred twenty-four".