25221270 has 16 divisors (see below), whose sum is σ = 60531120. Its totient is φ = 6725664.

The previous prime is 25221253. The next prime is 25221277. The reversal of 25221270 is 7212252.

It is a happy number.

It is a super-2 number, since 2×25221270² = 1272224920825800, which contains 22 as substring.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25221277) 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, 420325 + ... + 420384.

It is an arithmetic number, because the mean of its divisors is an integer number (3783195).

Almost surely, 2^25221270 is an apocalyptic number.

25221270 is an abundant number, since it is smaller than the sum of its proper divisors (35309850).

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

25221270 is a wasteful number, since it uses less digits than its factorization.

25221270 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 840719.

The product of its (nonzero) digits is 560, while the sum is 21.

The square root of 25221270 is about 5022.0782550653. The cubic root of 25221270 is about 293.2619043825.

The spelling of 25221270 in words is "twenty-five million, two hundred twenty-one thousand, two hundred seventy".