21925072 has 40 divisors (see below), whose sum is σ = 47746944. Its totient is φ = 9677184.

The previous prime is 21925021. The next prime is 21925097. The reversal of 21925072 is 27052912.

It is a self number, because there is not a number n which added to its sum of digits gives 21925072.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2493 + ... + 7075.

Almost surely, 2^21925072 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 21925072, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (23873472).

21925072 is an abundant number, since it is smaller than the sum of its proper divisors (25821872).

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

21925072 is a wasteful number, since it uses less digits than its factorization.

21925072 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4627 (or 4621 counting only the distinct ones).

The product of its (nonzero) digits is 2520, while the sum is 28.

The square root of 21925072 is about 4682.4215957131. The cubic root of 21925072 is about 279.8854633582.

Adding to 21925072 its reverse (27052912), we get a palindrome (48977984).

The spelling of 21925072 in words is "twenty-one million, nine hundred twenty-five thousand, seventy-two".