25221943 has 2 divisors, whose sum is σ = 25221944. Its totient is φ = 25221942.

The previous prime is 25221923. The next prime is 25221947. The reversal of 25221943 is 34912252.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 25221943 - 2¹³ = 25213751 is a prime.

It is a super-2 number, since 2×25221943² = 1272292817390498, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (25221947) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12610971 + 12610972.

It is an arithmetic number, because the mean of its divisors is an integer number (12610972).

Almost surely, 2^25221943 is an apocalyptic number.

25221943 is a deficient number, since it is larger than the sum of its proper divisors (1).

25221943 is an equidigital number, since it uses as much as digits as its factorization.

25221943 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 4320, while the sum is 28.

The square root of 25221943 is about 5022.1452587515. The cubic root of 25221943 is about 293.2645128092.

It can be divided in two parts, 2522 and 1943, that added together give a triangular number (4465 = T₉₄).

The spelling of 25221943 in words is "twenty-five million, two hundred twenty-one thousand, nine hundred forty-three".