20002122191 has 16 divisors (see below), whose sum is σ = 21274426368. Its totient is φ = 18740592000.

The previous prime is 20002122181. The next prime is 20002122193. The reversal of 20002122191 is 19122120002.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 20002122191 - 2¹⁴ = 20002105807 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 (20002122193) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 9385196 + ... + 9387326.

It is an arithmetic number, because the mean of its divisors is an integer number (1329651648).

Almost surely, 2^20002122191 is an apocalyptic number.

20002122191 is a deficient number, since it is larger than the sum of its proper divisors (1272304177).

20002122191 is a wasteful number, since it uses less digits than its factorization.

20002122191 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4382.

The product of its (nonzero) digits is 144, while the sum is 20.

Adding to 20002122191 its reverse (19122120002), we get a palindrome (39124242193).

The spelling of 20002122191 in words is "twenty billion, two million, one hundred twenty-two thousand, one hundred ninety-one".