21122120143 has 2 divisors, whose sum is σ = 21122120144. Its totient is φ = 21122120142.

The previous prime is 21122120137. The next prime is 21122120179. The reversal of 21122120143 is 34102122112.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21122120143 - 2¹³ = 21122111951 is a prime.

It is a super-2 number, since 2×21122120143² (a number of 21 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 21122120143.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21122180143) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10561060071 + 10561060072.

It is an arithmetic number, because the mean of its divisors is an integer number (10561060072).

Almost surely, 2^21122120143 is an apocalyptic number.

21122120143 is a deficient number, since it is larger than the sum of its proper divisors (1).

21122120143 is an equidigital number, since it uses as much as digits as its factorization.

21122120143 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 192, while the sum is 19.

Adding to 21122120143 its reverse (34102122112), we get a palindrome (55224242255).

The spelling of 21122120143 in words is "twenty-one billion, one hundred twenty-two million, one hundred twenty thousand, one hundred forty-three".