20001122121131 has 4 divisors (see below), whose sum is σ = 20001231627912. Its totient is φ = 20001012614352.

The previous prime is 20001122121061. The next prime is 20001122121161. The reversal of 20001122121131 is 13112122110002.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20001122121131 is a prime.

It is a super-2 number, since 2×20001122121131² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20001122121161) 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, 54478961 + ... + 54844866.

It is an arithmetic number, because the mean of its divisors is an integer number (5000307906978).

Almost surely, 2^{20001122121131} is an apocalyptic number.

20001122121131 is a deficient number, since it is larger than the sum of its proper divisors (109506781).

20001122121131 is a wasteful number, since it uses less digits than its factorization.

20001122121131 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 109506780.

The product of its (nonzero) digits is 48, while the sum is 17.

Adding to 20001122121131 its reverse (13112122110002), we get a palindrome (33113244231133).

The spelling of 20001122121131 in words is "twenty trillion, one billion, one hundred twenty-two million, one hundred twenty-one thousand, one hundred thirty-one".