25211321 has 2 divisors, whose sum is σ = 25211322. Its totient is φ = 25211320.

The previous prime is 25211293. The next prime is 25211341. The reversal of 25211321 is 12311252.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 24641296 + 570025 = 4964^2 + 755^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-25211321 is a prime.

It is a super-2 number, since 2×25211321² = 1271221413130082, which contains 22 as substring.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 25211321.

It is not a weakly prime, because it can be changed into another prime (25211341) by changing a digit.

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, 12605660 + 12605661.

It is an arithmetic number, because the mean of its divisors is an integer number (12605661).

Almost surely, 2^25211321 is an apocalyptic number.

It is an amenable number.

25211321 is a deficient number, since it is larger than the sum of its proper divisors (1).

25211321 is an equidigital number, since it uses as much as digits as its factorization.

25211321 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 120, while the sum is 17.

The square root of 25211321 is about 5021.0876311811. The cubic root of 25211321 is about 293.2233384364.

Adding to 25211321 its reverse (12311252), we get a palindrome (37522573).

The spelling of 25211321 in words is "twenty-five million, two hundred eleven thousand, three hundred twenty-one".