21233122213 has 4 divisors (see below), whose sum is σ = 22482129420. Its totient is φ = 19984115008.

The previous prime is 21233122171. The next prime is 21233122217. The reversal of 21233122213 is 31222133212.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 19211900449 + 2021221764 = 138607^2 + 44958^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21233122213 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 (21233122217) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 624503578 + ... + 624503611.

It is an arithmetic number, because the mean of its divisors is an integer number (5620532355).

Almost surely, 2^21233122213 is an apocalyptic number.

It is an amenable number.

21233122213 is a deficient number, since it is larger than the sum of its proper divisors (1249007207).

21233122213 is a wasteful number, since it uses less digits than its factorization.

21233122213 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1249007206.

The product of its digits is 864, while the sum is 22.

Adding to 21233122213 its reverse (31222133212), we get a palindrome (52455255425).

The spelling of 21233122213 in words is "twenty-one billion, two hundred thirty-three million, one hundred twenty-two thousand, two hundred thirteen".