21202222133 has 2 divisors, whose sum is σ = 21202222134. Its totient is φ = 21202222132.

The previous prime is 21202222109. The next prime is 21202222141. The reversal of 21202222133 is 33122220212.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 15540863569 + 5661358564 = 124663^2 + 75242^2 .

It is a cyclic number.

It is not a de Polignac number, because 21202222133 - 2⁸ = 21202221877 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21202222633) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10601111066 + 10601111067.

It is an arithmetic number, because the mean of its divisors is an integer number (10601111067).

Almost surely, 2^21202222133 is an apocalyptic number.

It is an amenable number.

21202222133 is a deficient number, since it is larger than the sum of its proper divisors (1).

21202222133 is an equidigital number, since it uses as much as digits as its factorization.

21202222133 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 576, while the sum is 20.

Adding to 21202222133 its reverse (33122220212), we get a palindrome (54324442345).

The spelling of 21202222133 in words is "twenty-one billion, two hundred two million, two hundred twenty-two thousand, one hundred thirty-three".