21221022199999 has 4 divisors (see below), whose sum is σ = 21621418845336. Its totient is φ = 20820625554664.

The previous prime is 21221022199987. The next prime is 21221022200039. The reversal of 21221022199999 is 99999122012212.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 21221022199999 - 2¹³ = 21221022191807 is a prime.

It is a Smith number, since the sum of its digits (58) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21221022199919) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 200198322589 + ... + 200198322694.

It is an arithmetic number, because the mean of its divisors is an integer number (5405354711334).

Almost surely, 2^{21221022199999} is an apocalyptic number.

21221022199999 is a deficient number, since it is larger than the sum of its proper divisors (400396645337).

21221022199999 is an equidigital number, since it uses as much as digits as its factorization.

21221022199999 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 400396645336.

The product of its (nonzero) digits is 1889568, while the sum is 58.

The spelling of 21221022199999 in words is "twenty-one trillion, two hundred twenty-one billion, twenty-two million, one hundred ninety-nine thousand, nine hundred ninety-nine".