21221220222099 has 8 divisors (see below), whose sum is σ = 31438844773520. Its totient is φ = 14147480148048.

The previous prime is 21221220222071. The next prime is 21221220222149. The reversal of 21221220222099 is 99022202212212.

21221220222099 is a `hidden beast` number, since 2 + 1 + 221 + 2 + 202 + 220 + 9 + 9 = 666.

It is not a de Polignac number, because 21221220222099 - 2⁴⁴ = 3629034177683 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21221220222029) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 392985559642 + ... + 392985559695.

It is an arithmetic number, because the mean of its divisors is an integer number (3929855596690).

Almost surely, 2^{21221220222099} is an apocalyptic number.

21221220222099 is a deficient number, since it is larger than the sum of its proper divisors (10217624551421).

21221220222099 is an equidigital number, since it uses as much as digits as its factorization.

21221220222099 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 785971119346 (or 785971119340 counting only the distinct ones).

The product of its (nonzero) digits is 20736, while the sum is 36.

The spelling of 21221220222099 in words is "twenty-one trillion, two hundred twenty-one billion, two hundred twenty million, two hundred twenty-two thousand, ninety-nine".