21223454143 has 64 divisors (see below), whose sum is σ = 24831442944. Its totient is φ = 18031104000.

The previous prime is 21223454129. The next prime is 21223454167. The reversal of 21223454143 is 34145432212.

It is a de Polignac number, because none of the positive numbers 2^k-21223454143 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (31).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21223454113) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 49242138 + ... + 49242568.

It is an arithmetic number, because the mean of its divisors is an integer number (387991296).

Almost surely, 2^21223454143 is an apocalyptic number.

21223454143 is a deficient number, since it is larger than the sum of its proper divisors (3607988801).

21223454143 is a wasteful number, since it uses less digits than its factorization.

21223454143 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 616.

The product of its digits is 23040, while the sum is 31.

Adding to 21223454143 its reverse (34145432212), we get a palindrome (55368886355).

The spelling of 21223454143 in words is "twenty-one billion, two hundred twenty-three million, four hundred fifty-four thousand, one hundred forty-three".