21211030297 has 2 divisors, whose sum is σ = 21211030298. Its totient is φ = 21211030296.

The previous prime is 21211030279. The next prime is 21211030303. The reversal of 21211030297 is 79203011212.

Together with previous prime (21211030279) it forms an Ormiston pair, because they use the same digits, order apart.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 21035441296 + 175589001 = 145036^2 + 13251^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21211030297 is a prime.

It is not a weakly prime, because it can be changed into another prime (21211030277) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10605515148 + 10605515149.

It is an arithmetic number, because the mean of its divisors is an integer number (10605515149).

Almost surely, 2^21211030297 is an apocalyptic number.

It is an amenable number.

21211030297 is a deficient number, since it is larger than the sum of its proper divisors (1).

21211030297 is an equidigital number, since it uses as much as digits as its factorization.

21211030297 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1512, while the sum is 28.

The spelling of 21211030297 in words is "twenty-one billion, two hundred eleven million, thirty thousand, two hundred ninety-seven".