21210021220199 has 4 divisors (see below), whose sum is σ = 24240024251664. Its totient is φ = 18180018188736.

The previous prime is 21210021220159. The next prime is 21210021220211. The reversal of 21210021220199 is 99102212001212.

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 21210021220199 - 2²⁸ = 21209752784743 is a prime.

It is a super-2 number, since 2×21210021220199² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21210021220159) 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, 1515001515722 + ... + 1515001515735.

It is an arithmetic number, because the mean of its divisors is an integer number (6060006062916).

Almost surely, 2^{21210021220199} is an apocalyptic number.

21210021220199 is a deficient number, since it is larger than the sum of its proper divisors (3030003031465).

21210021220199 is an equidigital number, since it uses as much as digits as its factorization.

21210021220199 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3030003031464.

The product of its (nonzero) digits is 2592, while the sum is 32.

The spelling of 21210021220199 in words is "twenty-one trillion, two hundred ten billion, twenty-one million, two hundred twenty thousand, one hundred ninety-nine".