21101098013 has 2 divisors, whose sum is σ = 21101098014. Its totient is φ = 21101098012.

The previous prime is 21101098009. The next prime is 21101098019. The reversal of 21101098013 is 31089010112.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 15320993284 + 5780104729 = 123778^2 + 76027^2 .

It is a cyclic number.

It is not a de Polignac number, because 21101098013 - 2² = 21101098009 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21101098019) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10550549006 + 10550549007.

It is an arithmetic number, because the mean of its divisors is an integer number (10550549007).

Almost surely, 2^21101098013 is an apocalyptic number.

It is an amenable number.

21101098013 is a deficient number, since it is larger than the sum of its proper divisors (1).

21101098013 is an equidigital number, since it uses as much as digits as its factorization.

21101098013 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 26.

The spelling of 21101098013 in words is "twenty-one billion, one hundred one million, ninety-eight thousand, thirteen".