20531211143 has 2 divisors, whose sum is σ = 20531211144. Its totient is φ = 20531211142.

The previous prime is 20531211139. The next prime is 20531211157. The reversal of 20531211143 is 34111213502.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 20531211143 - 2² = 20531211139 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20531211343) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10265605571 + 10265605572.

It is an arithmetic number, because the mean of its divisors is an integer number (10265605572).

Almost surely, 2^20531211143 is an apocalyptic number.

20531211143 is a deficient number, since it is larger than the sum of its proper divisors (1).

20531211143 is an equidigital number, since it uses as much as digits as its factorization.

20531211143 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 720, while the sum is 23.

Adding to 20531211143 its reverse (34111213502), we get a palindrome (54642424645).

The spelling of 20531211143 in words is "twenty billion, five hundred thirty-one million, two hundred eleven thousand, one hundred forty-three".