25424433513421 has 2 divisors, whose sum is σ = 25424433513422. Its totient is φ = 25424433513420.

The previous prime is 25424433513373. The next prime is 25424433513461. The reversal of 25424433513421 is 12431533442452.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 25114240210921 + 310193302500 = 5011411^2 + 556950^2 .

It is a cyclic number.

It is not a de Polignac number, because 25424433513421 - 2²⁷ = 25424299295693 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (25424433513461) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12712216756710 + 12712216756711.

It is an arithmetic number, because the mean of its divisors is an integer number (12712216756711).

Almost surely, 2^{25424433513421} is an apocalyptic number.

It is an amenable number.

25424433513421 is a deficient number, since it is larger than the sum of its proper divisors (1).

25424433513421 is an equidigital number, since it uses as much as digits as its factorization.

25424433513421 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1382400, while the sum is 43.

Adding to 25424433513421 its reverse (12431533442452), we get a palindrome (37855966955873).

The spelling of 25424433513421 in words is "twenty-five trillion, four hundred twenty-four billion, four hundred thirty-three million, five hundred thirteen thousand, four hundred twenty-one".