25270021 has 4 divisors (see below), whose sum is σ = 28880032. Its totient is φ = 21660012.

The previous prime is 25270009. The next prime is 25270033. The reversal of 25270021 is 12007252.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is an interprime number because it is at equal distance from previous prime (25270009) and next prime (25270033).

It is a cyclic number.

It is not a de Polignac number, because 25270021 - 2⁵ = 25269989 is a prime.

It is a super-2 number, since 2×25270021² = 1277147922680882, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25270081) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1804995 + ... + 1805008.

It is an arithmetic number, because the mean of its divisors is an integer number (7220008).

Almost surely, 2^25270021 is an apocalyptic number.

It is an amenable number.

25270021 is a deficient number, since it is larger than the sum of its proper divisors (3610011).

25270021 is an equidigital number, since it uses as much as digits as its factorization.

25270021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3610010.

The product of its (nonzero) digits is 280, while the sum is 19.

The square root of 25270021 is about 5026.9295797733. The cubic root of 25270021 is about 293.4507345430.

Adding to 25270021 its reverse (12007252), we get a palindrome (37277273).

The spelling of 25270021 in words is "twenty-five million, two hundred seventy thousand, twenty-one".