20201131211 has 4 divisors (see below), whose sum is σ = 20386462800. Its totient is φ = 20015799624.

The previous prime is 20201131177. The next prime is 20201131213. The reversal of 20201131211 is 11213110202.

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-20201131211 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20201131213) 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, 92665631 + ... + 92665848.

It is an arithmetic number, because the mean of its divisors is an integer number (5096615700).

Almost surely, 2^20201131211 is an apocalyptic number.

20201131211 is a deficient number, since it is larger than the sum of its proper divisors (185331589).

20201131211 is a wasteful number, since it uses less digits than its factorization.

20201131211 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 185331588.

The product of its (nonzero) digits is 24, while the sum is 14.

Adding to 20201131211 its reverse (11213110202), we get a palindrome (31414241413).

The spelling of 20201131211 in words is "twenty billion, two hundred one million, one hundred thirty-one thousand, two hundred eleven".