21030413161 has 2 divisors, whose sum is σ = 21030413162. Its totient is φ = 21030413160.

The previous prime is 21030413141. The next prime is 21030413203. The reversal of 21030413161 is 16131403012.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 20586510400 + 443902761 = 143480^2 + 21069^2 .

It is a cyclic number.

It is not a de Polignac number, because 21030413161 - 2²¹ = 21028316009 is a prime.

It is not a weakly prime, because it can be changed into another prime (21030413141) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10515206580 + 10515206581.

It is an arithmetic number, because the mean of its divisors is an integer number (10515206581).

Almost surely, 2^21030413161 is an apocalyptic number.

It is an amenable number.

21030413161 is a deficient number, since it is larger than the sum of its proper divisors (1).

21030413161 is an equidigital number, since it uses as much as digits as its factorization.

21030413161 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 432, while the sum is 22.

Adding to 21030413161 its reverse (16131403012), we get a palindrome (37161816173).

The spelling of 21030413161 in words is "twenty-one billion, thirty million, four hundred thirteen thousand, one hundred sixty-one".