20012122091 has 8 divisors (see below), whose sum is σ = 21640944864. Its totient is φ = 18396074880.

The previous prime is 20012122073. The next prime is 20012122103. The reversal of 20012122091 is 19022121002.

It is a happy number.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20012122091 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20012121091) 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, 3190631 + ... + 3196896.

It is an arithmetic number, because the mean of its divisors is an integer number (2705118108).

Almost surely, 2^20012122091 is an apocalyptic number.

20012122091 is a deficient number, since it is larger than the sum of its proper divisors (1628822773).

20012122091 is a wasteful number, since it uses less digits than its factorization.

20012122091 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6387781.

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

Adding to 20012122091 its reverse (19022121002), we get a palindrome (39034243093).

The spelling of 20012122091 in words is "twenty billion, twelve million, one hundred twenty-two thousand, ninety-one".