21212133301 has 2 divisors, whose sum is σ = 21212133302. Its totient is φ = 21212133300.

The previous prime is 21212133277. The next prime is 21212133307. The reversal of 21212133301 is 10333121212.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 20463016401 + 749116900 = 143049^2 + 27370^2 .

It is a cyclic number.

It is not a de Polignac number, because 21212133301 - 2²³ = 21203744693 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21212133307) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10606066650 + 10606066651.

It is an arithmetic number, because the mean of its divisors is an integer number (10606066651).

Almost surely, 2^21212133301 is an apocalyptic number.

It is an amenable number.

21212133301 is a deficient number, since it is larger than the sum of its proper divisors (1).

21212133301 is an equidigital number, since it uses as much as digits as its factorization.

21212133301 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 216, while the sum is 19.

Adding to 21212133301 its reverse (10333121212), we get a palindrome (31545254513).

The spelling of 21212133301 in words is "twenty-one billion, two hundred twelve million, one hundred thirty-three thousand, three hundred one".