25321421530 has 8 divisors (see below), whose sum is σ = 45578558772. Its totient is φ = 10128568608.

The previous prime is 25321421513. The next prime is 25321421569. The reversal of 25321421530 is 3512412352.

It can be written as a sum of positive squares in 2 ways, for example, as 25179025041 + 142396489 = 158679^2 + 11933^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1266071067 + ... + 1266071086.

Almost surely, 2^25321421530 is an apocalyptic number.

25321421530 is a deficient number, since it is larger than the sum of its proper divisors (20257137242).

25321421530 is a wasteful number, since it uses less digits than its factorization.

25321421530 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2532142160.

The product of its (nonzero) digits is 7200, while the sum is 28.

Adding to 25321421530 its reverse (3512412352), we get a palindrome (28833833882).

The spelling of 25321421530 in words is "twenty-five billion, three hundred twenty-one million, four hundred twenty-one thousand, five hundred thirty".