21795072 has 144 divisors (see below), whose sum is σ = 65244480. Its totient is φ = 6414336.

The previous prime is 21795043. The next prime is 21795079. The reversal of 21795072 is 27059712.

It is a hoax number, since the sum of its digits (33) coincides with the sum of the digits of its distinct prime factors.

It is not an unprimeable number, because it can be changed into a prime (21795079) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 369379 + ... + 369437.

Almost surely, 2^21795072 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 21795072, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (32622240).

21795072 is an abundant number, since it is smaller than the sum of its proper divisors (43449408).

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

21795072 is a wasteful number, since it uses less digits than its factorization.

21795072 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 128 (or 114 counting only the distinct ones).

The product of its (nonzero) digits is 8820, while the sum is 33.

The square root of 21795072 is about 4668.5192513258. The cubic root of 21795072 is about 279.3311928770.

The spelling of 21795072 in words is "twenty-one million, seven hundred ninety-five thousand, seventy-two".