25120226521 has 4 divisors (see below), whose sum is σ = 27052551652. Its totient is φ = 23187901392.

The previous prime is 25120226507. The next prime is 25120226531. The reversal of 25120226521 is 12562202152.

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 1802936521 + 23317290000 = 42461^2 + 152700^2 .

It is a cyclic number.

It is not a de Polignac number, because 25120226521 - 2¹⁵ = 25120193753 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 25120226521.

It is not an unprimeable number, because it can be changed into a prime (25120226531) 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, 966162546 + ... + 966162571.

It is an arithmetic number, because the mean of its divisors is an integer number (6763137913).

Almost surely, 2^25120226521 is an apocalyptic number.

It is an amenable number.

25120226521 is a deficient number, since it is larger than the sum of its proper divisors (1932325131).

25120226521 is a wasteful number, since it uses less digits than its factorization.

25120226521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1932325130.

The product of its (nonzero) digits is 4800, while the sum is 28.

Adding to 25120226521 its reverse (12562202152), we get a palindrome (37682428673).

The spelling of 25120226521 in words is "twenty-five billion, one hundred twenty million, two hundred twenty-six thousand, five hundred twenty-one".