20211231143 has 2 divisors, whose sum is σ = 20211231144. Its totient is φ = 20211231142.

The previous prime is 20211231109. The next prime is 20211231179. The reversal of 20211231143 is 34113211202.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 20211231143 - 2¹⁰ = 20211230119 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20211231043) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10105615571 + 10105615572.

It is an arithmetic number, because the mean of its divisors is an integer number (10105615572).

Almost surely, 2^20211231143 is an apocalyptic number.

20211231143 is a deficient number, since it is larger than the sum of its proper divisors (1).

20211231143 is an equidigital number, since it uses as much as digits as its factorization.

20211231143 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 288, while the sum is 20.

Adding to 20211231143 its reverse (34113211202), we get a palindrome (54324442345).

The spelling of 20211231143 in words is "twenty billion, two hundred eleven million, two hundred thirty-one thousand, one hundred forty-three".