21220099999 has 8 divisors (see below), whose sum is σ = 24258058880. Its totient is φ = 18183770136.

The previous prime is 21220099991. The next prime is 21220100021. The reversal of 21220099999 is 99999002212.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 21220099999 - 2³ = 21220099991 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 (21220099991) 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, 379209 + ... + 431554.

It is an arithmetic number, because the mean of its divisors is an integer number (3032257360).

Almost surely, 2^21220099999 is an apocalyptic number.

21220099999 is a deficient number, since it is larger than the sum of its proper divisors (3037958881).

21220099999 is an equidigital number, since it uses as much as digits as its factorization.

21220099999 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 814509.

The product of its (nonzero) digits is 472392, while the sum is 52.

The spelling of 21220099999 in words is "twenty-one billion, two hundred twenty million, ninety-nine thousand, nine hundred ninety-nine".