20123101543 has 2 divisors, whose sum is σ = 20123101544. Its totient is φ = 20123101542.

The previous prime is 20123101507. The next prime is 20123101549. The reversal of 20123101543 is 34510132102.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 20123101543 - 2²⁵ = 20089547111 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20123101549) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10061550771 + 10061550772.

It is an arithmetic number, because the mean of its divisors is an integer number (10061550772).

Almost surely, 2^20123101543 is an apocalyptic number.

20123101543 is a deficient number, since it is larger than the sum of its proper divisors (1).

20123101543 is an equidigital number, since it uses as much as digits as its factorization.

20123101543 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 22.

Adding to 20123101543 its reverse (34510132102), we get a palindrome (54633233645).

The spelling of 20123101543 in words is "twenty billion, one hundred twenty-three million, one hundred one thousand, five hundred forty-three".