25221445321 has 4 divisors (see below), whose sum is σ = 25221763072. Its totient is φ = 25221127572.

The previous prime is 25221445313. The next prime is 25221445343. The reversal of 25221445321 is 12354412252.

It is a happy number.

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 25221445321 - 2³ = 25221445313 is a prime.

It is a super-2 number, since 2×25221445321² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (25221445351) 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, 72760 + ... + 236086.

It is an arithmetic number, because the mean of its divisors is an integer number (6305440768).

Almost surely, 2^25221445321 is an apocalyptic number.

It is an amenable number.

25221445321 is a deficient number, since it is larger than the sum of its proper divisors (317751).

25221445321 is a wasteful number, since it uses less digits than its factorization.

25221445321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 317750.

The product of its digits is 19200, while the sum is 31.

Adding to 25221445321 its reverse (12354412252), we get a palindrome (37575857573).

The spelling of 25221445321 in words is "twenty-five billion, two hundred twenty-one million, four hundred forty-five thousand, three hundred twenty-one".