21120030313 has 2 divisors, whose sum is σ = 21120030314. Its totient is φ = 21120030312.

The previous prime is 21120030307. The next prime is 21120030341. The reversal of 21120030313 is 31303002112.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 21117030489 + 2999824 = 145317^2 + 1732^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21120030313 is a prime.

It is not a weakly prime, because it can be changed into another prime (21120030353) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10560015156 + 10560015157.

It is an arithmetic number, because the mean of its divisors is an integer number (10560015157).

Almost surely, 2^21120030313 is an apocalyptic number.

It is an amenable number.

21120030313 is a deficient number, since it is larger than the sum of its proper divisors (1).

21120030313 is an equidigital number, since it uses as much as digits as its factorization.

21120030313 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 108, while the sum is 16.

Adding to 21120030313 its reverse (31303002112), we get a palindrome (52423032425).

The spelling of 21120030313 in words is "twenty-one billion, one hundred twenty million, thirty thousand, three hundred thirteen".