21212220010999 has 4 divisors (see below), whose sum is σ = 21234156123664. Its totient is φ = 21190283898336.

The previous prime is 21212220010997. The next prime is 21212220011083. The reversal of 21212220010999 is 99901002221212.

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 21212220010999 - 2¹ = 21212220010997 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21212220010997) 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, 10968054882 + ... + 10968056815.

It is an arithmetic number, because the mean of its divisors is an integer number (5308539030916).

Almost surely, 2^{21212220010999} is an apocalyptic number.

21212220010999 is a deficient number, since it is larger than the sum of its proper divisors (21936112665).

21212220010999 is an equidigital number, since it uses as much as digits as its factorization.

21212220010999 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21936112664.

The product of its (nonzero) digits is 23328, while the sum is 40.

The spelling of 21212220010999 in words is "twenty-one trillion, two hundred twelve billion, two hundred twenty million, ten thousand, nine hundred ninety-nine".