21926424 has 64 divisors (see below), whose sum is σ = 60963840. Its totient is φ = 6526080.

The previous prime is 21926419. The next prime is 21926441. The reversal of 21926424 is 42462912.

It is a hoax number, since the sum of its digits (30) coincides with the sum of the digits of its distinct prime factors.

It is a junction number, because it is equal to n+sod(n) for n = 21926391 and 21926400.

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, 8539 + ... + 10805.

It is an arithmetic number, because the mean of its divisors is an integer number (952560).

Almost surely, 2^21926424 is an apocalyptic number.

21926424 is a gapful number since it is divisible by the number (24) 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 21926424, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (30481920).

21926424 is an abundant number, since it is smaller than the sum of its proper divisors (39037416).

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

21926424 is a wasteful number, since it uses less digits than its factorization.

21926424 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2320 (or 2316 counting only the distinct ones).

The product of its digits is 6912, while the sum is 30.

The square root of 21926424 is about 4682.5659632300. The cubic root of 21926424 is about 279.8912162449.

The spelling of 21926424 in words is "twenty-one million, nine hundred twenty-six thousand, four hundred twenty-four".