25221787 has 2 divisors, whose sum is σ = 25221788. Its totient is φ = 25221786.

The previous prime is 25221773. The next prime is 25221839. The reversal of 25221787 is 78712252.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 25221787 - 2¹⁹ = 24697499 is a prime.

It is a super-2 number, since 2×25221787² = 1272277078946738, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (25221767) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12610893 + 12610894.

It is an arithmetic number, because the mean of its divisors is an integer number (12610894).

Almost surely, 2^25221787 is an apocalyptic number.

25221787 is a deficient number, since it is larger than the sum of its proper divisors (1).

25221787 is an equidigital number, since it uses as much as digits as its factorization.

25221787 is an evil number, because the sum of its binary digits is even.

The product of its digits is 15680, while the sum is 34.

The square root of 25221787 is about 5022.1297275160. The cubic root of 25221787 is about 293.2639081855.

The spelling of 25221787 in words is "twenty-five million, two hundred twenty-one thousand, seven hundred eighty-seven".