21959330399 has 2 divisors, whose sum is σ = 21959330400. Its totient is φ = 21959330398.

The previous prime is 21959330383. The next prime is 21959330411. The reversal of 21959330399 is 99303395912.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21959330399 - 2⁴ = 21959330383 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 21959330399.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21959330329) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10979665199 + 10979665200.

It is an arithmetic number, because the mean of its divisors is an integer number (10979665200).

Almost surely, 2^21959330399 is an apocalyptic number.

21959330399 is a deficient number, since it is larger than the sum of its proper divisors (1).

21959330399 is an equidigital number, since it uses as much as digits as its factorization.

21959330399 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1771470, while the sum is 53.

The spelling of 21959330399 in words is "twenty-one billion, nine hundred fifty-nine million, three hundred thirty thousand, three hundred ninety-nine".