21143224213 has 16 divisors (see below), whose sum is σ = 22480815600. Its totient is φ = 19853729280.

The previous prime is 21143224127. The next prime is 21143224243. The reversal of 21143224213 is 31242234112.

It can be written as a sum of positive squares in 8 ways, for example, as 999950884 + 20143273329 = 31622^2 + 141927^2 .

It is a cyclic number.

It is not a de Polignac number, because 21143224213 - 2²¹ = 21141127061 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21143224243) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 90295 + ... + 224587.

It is an arithmetic number, because the mean of its divisors is an integer number (1405050975).

Almost surely, 2^21143224213 is an apocalyptic number.

It is an amenable number.

21143224213 is a deficient number, since it is larger than the sum of its proper divisors (1337591387).

21143224213 is a wasteful number, since it uses less digits than its factorization.

21143224213 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 134472.

The product of its digits is 2304, while the sum is 25.

Adding to 21143224213 its reverse (31242234112), we get a palindrome (52385458325).

The spelling of 21143224213 in words is "twenty-one billion, one hundred forty-three million, two hundred twenty-four thousand, two hundred thirteen".