21822725 has 12 divisors (see below), whose sum is σ = 27227424. Its totient is φ = 17350320.

The previous prime is 21822721. The next prime is 21822727. The reversal of 21822725 is 52722812.

It is not a de Polignac number, because 21822725 - 2² = 21822721 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21822721) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1562 + ... + 6788.

It is an arithmetic number, because the mean of its divisors is an integer number (2268952).

Almost surely, 2^21822725 is an apocalyptic number.

21822725 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

21822725 is a deficient number, since it is larger than the sum of its proper divisors (5404699).

21822725 is a wasteful number, since it uses less digits than its factorization.

21822725 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5404 (or 5399 counting only the distinct ones).

The product of its digits is 4480, while the sum is 29.

The square root of 21822725 is about 4671.4799582145. The cubic root of 21822725 is about 279.4492789129.

The spelling of 21822725 in words is "twenty-one million, eight hundred twenty-two thousand, seven hundred twenty-five".