25221993 has 4 divisors (see below), whose sum is σ = 33629328. Its totient is φ = 16814660.

The previous prime is 25221991. The next prime is 25221997. The reversal of 25221993 is 39912252.

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 25221993 - 2¹ = 25221991 is a prime.

It is a super-2 number, since 2×25221993² = 1272297861784098, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (25221991) 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, 4203663 + ... + 4203668.

It is an arithmetic number, because the mean of its divisors is an integer number (8407332).

Almost surely, 2^25221993 is an apocalyptic number.

It is an amenable number.

25221993 is a deficient number, since it is larger than the sum of its proper divisors (8407335).

25221993 is an equidigital number, since it uses as much as digits as its factorization.

25221993 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8407334.

The product of its digits is 9720, while the sum is 33.

The square root of 25221993 is about 5022.1502367014. The cubic root of 25221993 is about 293.2647065984.

The spelling of 25221993 in words is "twenty-five million, two hundred twenty-one thousand, nine hundred ninety-three".