25424122921 has 2 divisors, whose sum is σ = 25424122922. Its totient is φ = 25424122920.

The previous prime is 25424122877. The next prime is 25424122957. The reversal of 25424122921 is 12922142452.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 17302508521 + 8121614400 = 131539^2 + 90120^2 .

It is a cyclic number.

It is not a de Polignac number, because 25424122921 - 2³¹ = 23276639273 is a prime.

It is not a weakly prime, because it can be changed into another prime (25424122121) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12712061460 + 12712061461.

It is an arithmetic number, because the mean of its divisors is an integer number (12712061461).

Almost surely, 2^25424122921 is an apocalyptic number.

It is an amenable number.

25424122921 is a deficient number, since it is larger than the sum of its proper divisors (1).

25424122921 is an equidigital number, since it uses as much as digits as its factorization.

25424122921 is an evil number, because the sum of its binary digits is even.

The product of its digits is 23040, while the sum is 34.

The spelling of 25424122921 in words is "twenty-five billion, four hundred twenty-four million, one hundred twenty-two thousand, nine hundred twenty-one".