21210222001099 has 4 divisors (see below), whose sum is σ = 21215299865464. Its totient is φ = 21205144136736.

The previous prime is 21210222001093. The next prime is 21210222001127. The reversal of 21210222001099 is 99010022201212.

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 21210222001099 - 2⁷ = 21210222000971 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 21210222001099.

It is not an unprimeable number, because it can be changed into a prime (21210222001093) 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, 2538925917 + ... + 2538934270.

It is an arithmetic number, because the mean of its divisors is an integer number (5303824966366).

Almost surely, 2^{21210222001099} is an apocalyptic number.

21210222001099 is a deficient number, since it is larger than the sum of its proper divisors (5077864365).

21210222001099 is an equidigital number, since it uses as much as digits as its factorization.

21210222001099 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5077864364.

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

The spelling of 21210222001099 in words is "twenty-one trillion, two hundred ten billion, two hundred twenty-two million, one thousand, ninety-nine".