21202120021099 has 2 divisors, whose sum is σ = 21202120021100. Its totient is φ = 21202120021098.

The previous prime is 21202120021091. The next prime is 21202120021123. The reversal of 21202120021099 is 99012002120212.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21202120021099 - 2³ = 21202120021091 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 21202120021099.

It is not a weakly prime, because it can be changed into another prime (21202120021091) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10601060010549 + 10601060010550.

It is an arithmetic number, because the mean of its divisors is an integer number (10601060010550).

Almost surely, 2^{21202120021099} is an apocalyptic number.

21202120021099 is a deficient number, since it is larger than the sum of its proper divisors (1).

21202120021099 is an equidigital number, since it uses as much as digits as its factorization.

21202120021099 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2592, while the sum is 31.

The spelling of 21202120021099 in words is "twenty-one trillion, two hundred two billion, one hundred twenty million, twenty-one thousand, ninety-nine".