305025050021 has 2 divisors, whose sum is σ = 305025050022. Its totient is φ = 305025050020.

The previous prime is 305025049999. The next prime is 305025050023. The reversal of 305025050021 is 120050520503.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 222558441121 + 82466608900 = 471761^2 + 287170^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-305025050021 is a prime.

It is a super-2 number, since 2×305025050021² (a number of 24 digits) contains 22 as substring.

Together with 305025050023, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (305025050023) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 152512525010 + 152512525011.

It is an arithmetic number, because the mean of its divisors is an integer number (152512525011).

Almost surely, 2^305025050021 is an apocalyptic number.

It is an amenable number.

305025050021 is a deficient number, since it is larger than the sum of its proper divisors (1).

305025050021 is an equidigital number, since it uses as much as digits as its factorization.

305025050021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1500, while the sum is 23.

Adding to 305025050021 its reverse (120050520503), we get a palindrome (425075570524).

The spelling of 305025050021 in words is "three hundred five billion, twenty-five million, fifty thousand, twenty-one".