20212131202111 has 4 divisors (see below), whose sum is σ = 20212146435352. Its totient is φ = 20212115968872.

The previous prime is 20212131202093. The next prime is 20212131202139. The reversal of 20212131202111 is 11120213121202.

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

It is a cyclic number.

It is not a de Polignac number, because 20212131202111 - 2²⁷ = 20211996984383 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 (20212131202171) 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, 5414040 + ... + 8350813.

It is an arithmetic number, because the mean of its divisors is an integer number (5053036608838).

Almost surely, 2^{20212131202111} is an apocalyptic number.

20212131202111 is a deficient number, since it is larger than the sum of its proper divisors (15233241).

20212131202111 is a wasteful number, since it uses less digits than its factorization.

20212131202111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15233240.

The product of its (nonzero) digits is 96, while the sum is 19.

Adding to 20212131202111 its reverse (11120213121202), we get a palindrome (31332344323313).

The spelling of 20212131202111 in words is "twenty trillion, two hundred twelve billion, one hundred thirty-one million, two hundred two thousand, one hundred eleven".