215213333021 has 2 divisors, whose sum is σ = 215213333022. Its totient is φ = 215213333020.

The previous prime is 215213332973. The next prime is 215213333063. The reversal of 215213333021 is 120333312512.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 111548652121 + 103664680900 = 333989^2 + 321970^2 .

It is a cyclic number.

It is not a de Polignac number, because 215213333021 - 2¹⁰ = 215213331997 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (215213333821) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 107606666510 + 107606666511.

It is an arithmetic number, because the mean of its divisors is an integer number (107606666511).

Almost surely, 2^215213333021 is an apocalyptic number.

It is an amenable number.

215213333021 is a deficient number, since it is larger than the sum of its proper divisors (1).

215213333021 is an equidigital number, since it uses as much as digits as its factorization.

215213333021 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3240, while the sum is 26.

Adding to 215213333021 its reverse (120333312512), we get a palindrome (335546645533).

The spelling of 215213333021 in words is "two hundred fifteen billion, two hundred thirteen million, three hundred thirty-three thousand, twenty-one".