25224022021 has 4 divisors (see below), whose sum is σ = 27517114944. Its totient is φ = 22930929100.

The previous prime is 25224021997. The next prime is 25224022039. The reversal of 25224022021 is 12022042252.

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 25224022021 - 2⁹ = 25224021509 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 25224021983 and 25224022001.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25224082021) 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, 1146546445 + ... + 1146546466.

It is an arithmetic number, because the mean of its divisors is an integer number (6879278736).

Almost surely, 2^25224022021 is an apocalyptic number.

It is an amenable number.

25224022021 is a deficient number, since it is larger than the sum of its proper divisors (2293092923).

25224022021 is a wasteful number, since it uses less digits than its factorization.

25224022021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2293092922.

The product of its (nonzero) digits is 1280, while the sum is 22.

Adding to 25224022021 its reverse (12022042252), we get a palindrome (37246064273).

The spelling of 25224022021 in words is "twenty-five billion, two hundred twenty-four million, twenty-two thousand, twenty-one".