21103331297 has 2 divisors, whose sum is σ = 21103331298. Its totient is φ = 21103331296.

The previous prime is 21103331281. The next prime is 21103331341. The reversal of 21103331297 is 79213330112.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 20944167841 + 159163456 = 144721^2 + 12616^2 .

It is a cyclic number.

It is not a de Polignac number, because 21103331297 - 2⁴ = 21103331281 is a prime.

It is not a weakly prime, because it can be changed into another prime (21103331237) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10551665648 + 10551665649.

It is an arithmetic number, because the mean of its divisors is an integer number (10551665649).

Almost surely, 2^21103331297 is an apocalyptic number.

It is an amenable number.

21103331297 is a deficient number, since it is larger than the sum of its proper divisors (1).

21103331297 is an equidigital number, since it uses as much as digits as its factorization.

21103331297 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 6804, while the sum is 32.

The spelling of 21103331297 in words is "twenty-one billion, one hundred three million, three hundred thirty-one thousand, two hundred ninety-seven".