21102201999959 has 2 divisors, whose sum is σ = 21102201999960. Its totient is φ = 21102201999958.

The previous prime is 21102201999889. The next prime is 21102202000043. The reversal of 21102201999959 is 95999910220112.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21102201999959 - 2¹² = 21102201995863 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21102201999898 and 21102201999907.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21102201999559) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10551100999979 + 10551100999980.

It is an arithmetic number, because the mean of its divisors is an integer number (10551100999980).

Almost surely, 2^{21102201999959} is an apocalyptic number.

21102201999959 is a deficient number, since it is larger than the sum of its proper divisors (1).

21102201999959 is an equidigital number, since it uses as much as digits as its factorization.

21102201999959 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2361960, while the sum is 59.

The spelling of 21102201999959 in words is "twenty-one trillion, one hundred two billion, two hundred one million, nine hundred ninety-nine thousand, nine hundred fifty-nine".