21030423241 has 2 divisors, whose sum is σ = 21030423242. Its totient is φ = 21030423240.

The previous prime is 21030423233. The next prime is 21030423259. The reversal of 21030423241 is 14232403012.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 15553831225 + 5476592016 = 124715^2 + 74004^2 .

It is a cyclic number.

It is not a de Polignac number, because 21030423241 - 2³ = 21030423233 is a prime.

It is not a weakly prime, because it can be changed into another prime (21030423341) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10515211620 + 10515211621.

It is an arithmetic number, because the mean of its divisors is an integer number (10515211621).

Almost surely, 2^21030423241 is an apocalyptic number.

It is an amenable number.

21030423241 is a deficient number, since it is larger than the sum of its proper divisors (1).

21030423241 is an equidigital number, since it uses as much as digits as its factorization.

21030423241 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1152, while the sum is 22.

Adding to 21030423241 its reverse (14232403012), we get a palindrome (35262826253).

The spelling of 21030423241 in words is "twenty-one billion, thirty million, four hundred twenty-three thousand, two hundred forty-one".