21421122143 has 2 divisors, whose sum is σ = 21421122144. Its totient is φ = 21421122142.

The previous prime is 21421122097. The next prime is 21421122181. The reversal of 21421122143 is 34122112412.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21421122143 - 2¹⁰ = 21421121119 is a prime.

It is a Sophie Germain prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21421122043) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10710561071 + 10710561072.

It is an arithmetic number, because the mean of its divisors is an integer number (10710561072).

Almost surely, 2^21421122143 is an apocalyptic number.

21421122143 is a deficient number, since it is larger than the sum of its proper divisors (1).

21421122143 is an equidigital number, since it uses as much as digits as its factorization.

21421122143 is an evil number, because the sum of its binary digits is even.

The product of its digits is 768, while the sum is 23.

Adding to 21421122143 its reverse (34122112412), we get a palindrome (55543234555).

The spelling of 21421122143 in words is "twenty-one billion, four hundred twenty-one million, one hundred twenty-two thousand, one hundred forty-three".