20213122199 has 4 divisors (see below), whose sum is σ = 20544484920. Its totient is φ = 19881759480.

The previous prime is 20213122183. The next prime is 20213122201. The reversal of 20213122199 is 99122131202.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 99122131202 = 2 ⋅49561065601.

It is a cyclic number.

It is not a de Polignac number, because 20213122199 - 2⁴ = 20213122183 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 (20213122159) 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, 165681269 + ... + 165681390.

It is an arithmetic number, because the mean of its divisors is an integer number (5136121230).

Almost surely, 2^20213122199 is an apocalyptic number.

20213122199 is a deficient number, since it is larger than the sum of its proper divisors (331362721).

20213122199 is an equidigital number, since it uses as much as digits as its factorization.

20213122199 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 331362720.

The product of its (nonzero) digits is 3888, while the sum is 32.

The spelling of 20213122199 in words is "twenty billion, two hundred thirteen million, one hundred twenty-two thousand, one hundred ninety-nine".