25221029 has 4 divisors (see below), whose sum is σ = 25231776. Its totient is φ = 25210284.

The previous prime is 25221023. The next prime is 25221043. The reversal of 25221029 is 92012252.

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, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 25221029 - 2⁸ = 25220773 is a prime.

It is a super-2 number, since 2×25221029² = 1272200607637682, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 25220995 and 25221013.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25221023) 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, 179 + ... + 7104.

It is an arithmetic number, because the mean of its divisors is an integer number (6307944).

Almost surely, 2^25221029 is an apocalyptic number.

It is an amenable number.

25221029 is a deficient number, since it is larger than the sum of its proper divisors (10747).

25221029 is an equidigital number, since it uses as much as digits as its factorization.

25221029 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10746.

The product of its (nonzero) digits is 720, while the sum is 23.

The square root of 25221029 is about 5022.0542609574. The cubic root of 25221029 is about 293.2609702986.

The spelling of 25221029 in words is "twenty-five million, two hundred twenty-one thousand, twenty-nine".