22425721 has 8 divisors (see below), whose sum is σ = 23143680. Its totient is φ = 21717888.

The previous prime is 22425709. The next prime is 22425743. The reversal of 22425721 is 12752422.

22425721 = T₂₃₈ + T₂₃₉ + ... + T₅₂₈.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 22425721 - 2⁷ = 22425593 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (22425701) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2100 + ... + 7018.

It is an arithmetic number, because the mean of its divisors is an integer number (2892960).

Almost surely, 2^22425721 is an apocalyptic number.

It is an amenable number.

22425721 is a deficient number, since it is larger than the sum of its proper divisors (717959).

22425721 is an equidigital number, since it uses as much as digits as its factorization.

22425721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5063.

The product of its digits is 2240, while the sum is 25.

The square root of 22425721 is about 4735.5803234662. The cubic root of 22425721 is about 281.9998029943. Note that the first 3 decimals are identical.

The spelling of 22425721 in words is "twenty-two million, four hundred twenty-five thousand, seven hundred twenty-one".