21024325121 has 2 divisors, whose sum is σ = 21024325122. Its totient is φ = 21024325120.

The previous prime is 21024325067. The next prime is 21024325123. The reversal of 21024325121 is 12152342012.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 19422324496 + 1602000625 = 139364^2 + 40025^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21024325121 is a prime.

Together with 21024325123, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (21024325123) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10512162560 + 10512162561.

It is an arithmetic number, because the mean of its divisors is an integer number (10512162561).

Almost surely, 2^21024325121 is an apocalyptic number.

It is an amenable number.

21024325121 is a deficient number, since it is larger than the sum of its proper divisors (1).

21024325121 is an equidigital number, since it uses as much as digits as its factorization.

21024325121 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 960, while the sum is 23.

Adding to 21024325121 its reverse (12152342012), we get a palindrome (33176667133).

The spelling of 21024325121 in words is "twenty-one billion, twenty-four million, three hundred twenty-five thousand, one hundred twenty-one".