21221124143 has 2 divisors, whose sum is σ = 21221124144. Its totient is φ = 21221124142.

The previous prime is 21221124097. The next prime is 21221124233. The reversal of 21221124143 is 34142112212.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21221124143 - 2¹² = 21221120047 is a prime.

It is a super-2 number, since 2×21221124143² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21221124943) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10610562071 + 10610562072.

It is an arithmetic number, because the mean of its divisors is an integer number (10610562072).

Almost surely, 2^21221124143 is an apocalyptic number.

21221124143 is a deficient number, since it is larger than the sum of its proper divisors (1).

21221124143 is an equidigital number, since it uses as much as digits as its factorization.

21221124143 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 21221124143 its reverse (34142112212), we get a palindrome (55363236355).

The spelling of 21221124143 in words is "twenty-one billion, two hundred twenty-one million, one hundred twenty-four thousand, one hundred forty-three".