25221722 has 4 divisors (see below), whose sum is σ = 37832586. Its totient is φ = 12610860.

The previous prime is 25221673. The next prime is 25221739. The reversal of 25221722 is 22712252.

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

It can be written as a sum of positive squares in only one way, i.e., 19456921 + 5764801 = 4411^2 + 2401^2 .

It is a super-2 number, since 2×25221722² = 1272270521290568, which contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6305429 + ... + 6305432.

Almost surely, 2^25221722 is an apocalyptic number.

25221722 is a deficient number, since it is larger than the sum of its proper divisors (12610864).

25221722 is a wasteful number, since it uses less digits than its factorization.

25221722 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12610863.

The product of its digits is 1120, while the sum is 23.

The square root of 25221722 is about 5022.1232561537. The cubic root of 25221722 is about 293.2636562582.

Adding to 25221722 its reverse (22712252), we get a palindrome (47933974).

The spelling of 25221722 in words is "twenty-five million, two hundred twenty-one thousand, seven hundred twenty-two".