21230221297 has 2 divisors, whose sum is σ = 21230221298. Its totient is φ = 21230221296.

The previous prime is 21230221291. The next prime is 21230221321. The reversal of 21230221297 is 79212203212.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 15355918561 + 5874302736 = 123919^2 + 76644^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21230221297 is a prime.

It is not a weakly prime, because it can be changed into another prime (21230221291) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10615110648 + 10615110649.

It is an arithmetic number, because the mean of its divisors is an integer number (10615110649).

Almost surely, 2^21230221297 is an apocalyptic number.

It is an amenable number.

21230221297 is a deficient number, since it is larger than the sum of its proper divisors (1).

21230221297 is an equidigital number, since it uses as much as digits as its factorization.

21230221297 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 6048, while the sum is 31.

The spelling of 21230221297 in words is "twenty-one billion, two hundred thirty million, two hundred twenty-one thousand, two hundred ninety-seven".