21630622213 has 2 divisors, whose sum is σ = 21630622214. Its totient is φ = 21630622212.

The previous prime is 21630622187. The next prime is 21630622267. The reversal of 21630622213 is 31222603612.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 11466554724 + 10164067489 = 107082^2 + 100817^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21630622213 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21630622513) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10815311106 + 10815311107.

It is an arithmetic number, because the mean of its divisors is an integer number (10815311107).

Almost surely, 2^21630622213 is an apocalyptic number.

It is an amenable number.

21630622213 is a deficient number, since it is larger than the sum of its proper divisors (1).

21630622213 is an equidigital number, since it uses as much as digits as its factorization.

21630622213 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 5184, while the sum is 28.

The spelling of 21630622213 in words is "twenty-one billion, six hundred thirty million, six hundred twenty-two thousand, two hundred thirteen".