21220121199 has 8 divisors (see below), whose sum is σ = 28553068720. Its totient is φ = 14016960576.

The previous prime is 21220121183. The next prime is 21220121203. The reversal of 21220121199 is 99112102212.

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

It is not a de Polignac number, because 21220121199 - 2⁴ = 21220121183 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 (21220121129) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 32446342 + ... + 32446995.

It is an arithmetic number, because the mean of its divisors is an integer number (3569133590).

Almost surely, 2^21220121199 is an apocalyptic number.

21220121199 is a deficient number, since it is larger than the sum of its proper divisors (7332947521).

21220121199 is a wasteful number, since it uses less digits than its factorization.

21220121199 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 64893449.

The product of its (nonzero) digits is 1296, while the sum is 30.

The spelling of 21220121199 in words is "twenty-one billion, two hundred twenty million, one hundred twenty-one thousand, one hundred ninety-nine".