25233106421 has 2 divisors, whose sum is σ = 25233106422. Its totient is φ = 25233106420.

The previous prime is 25233106417. The next prime is 25233106429. The reversal of 25233106421 is 12460133252.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 21982510225 + 3250596196 = 148265^2 + 57014^2 .

It is a cyclic number.

It is not a de Polignac number, because 25233106421 - 2² = 25233106417 is a prime.

It is a super-2 number, since 2×25233106421² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (25233106429) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12616553210 + 12616553211.

It is an arithmetic number, because the mean of its divisors is an integer number (12616553211).

Almost surely, 2^25233106421 is an apocalyptic number.

It is an amenable number.

25233106421 is a deficient number, since it is larger than the sum of its proper divisors (1).

25233106421 is an equidigital number, since it uses as much as digits as its factorization.

25233106421 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 8640, while the sum is 29.

Adding to 25233106421 its reverse (12460133252), we get a palindrome (37693239673).

The spelling of 25233106421 in words is "twenty-five billion, two hundred thirty-three million, one hundred six thousand, four hundred twenty-one".