21011313233143 has 2 divisors, whose sum is σ = 21011313233144. Its totient is φ = 21011313233142.

The previous prime is 21011313233107. The next prime is 21011313233171. The reversal of 21011313233143 is 34133231311012.

It is an a-pointer prime, because the next prime (21011313233171) can be obtained adding 21011313233143 to its sum of digits (28).

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21011313233143 - 2³³ = 21002723298551 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21011313230143) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10505656616571 + 10505656616572.

It is an arithmetic number, because the mean of its divisors is an integer number (10505656616572).

Almost surely, 2^{21011313233143} is an apocalyptic number.

21011313233143 is a deficient number, since it is larger than the sum of its proper divisors (1).

21011313233143 is an equidigital number, since it uses as much as digits as its factorization.

21011313233143 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3888, while the sum is 28.

Adding to 21011313233143 its reverse (34133231311012), we get a palindrome (55144544544155).

The spelling of 21011313233143 in words is "twenty-one trillion, eleven billion, three hundred thirteen million, two hundred thirty-three thousand, one hundred forty-three".