25726021 has 4 divisors (see below), whose sum is σ = 25896544. Its totient is φ = 25555500.

The previous prime is 25726007. The next prime is 25726031. The reversal of 25726021 is 12062752.

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 a cyclic number.

It is not a de Polignac number, because 25726021 - 2⁹ = 25725509 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 (25726031) 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, 85035 + ... + 85336.

It is an arithmetic number, because the mean of its divisors is an integer number (6474136).

Almost surely, 2^25726021 is an apocalyptic number.

It is an amenable number.

25726021 is a deficient number, since it is larger than the sum of its proper divisors (170523).

25726021 is a wasteful number, since it uses less digits than its factorization.

25726021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 170522.

The product of its (nonzero) digits is 1680, while the sum is 25.

The square root of 25726021 is about 5072.0825111585. The cubic root of 25726021 is about 295.2053382223.

Adding to 25726021 its reverse (12062752), we get a palindrome (37788773).

The spelling of 25726021 in words is "twenty-five million, seven hundred twenty-six thousand, twenty-one".