25126021 has 4 divisors (see below), whose sum is σ = 25234092. Its totient is φ = 25017952.

The previous prime is 25125979. The next prime is 25126033. The reversal of 25126021 is 12062152.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 4468996 + 20657025 = 2114^2 + 4545^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-25126021 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 25126021.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25120021) 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, 53686 + ... + 54151.

It is an arithmetic number, because the mean of its divisors is an integer number (6308523).

Almost surely, 2^25126021 is an apocalyptic number.

It is an amenable number.

25126021 is a deficient number, since it is larger than the sum of its proper divisors (108071).

25126021 is a wasteful number, since it uses less digits than its factorization.

25126021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 108070.

The product of its (nonzero) digits is 240, while the sum is 19.

The square root of 25126021 is about 5012.5862586094. The cubic root of 25126021 is about 292.8922674281.

Adding to 25126021 its reverse (12062152), we get a palindrome (37188173).

The spelling of 25126021 in words is "twenty-five million, one hundred twenty-six thousand, twenty-one".