21021111333373 has 2 divisors, whose sum is σ = 21021111333374. Its totient is φ = 21021111333372.

The previous prime is 21021111333359. The next prime is 21021111333377. The reversal of 21021111333373 is 37333311112012.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 20761528216324 + 259583117049 = 4556482^2 + 509493^2 .

It is a cyclic number.

It is not a de Polignac number, because 21021111333373 - 2²¹ = 21021109236221 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21021111333377) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10510555666686 + 10510555666687.

It is an arithmetic number, because the mean of its divisors is an integer number (10510555666687).

Almost surely, 2^{21021111333373} is an apocalyptic number.

It is an amenable number.

21021111333373 is a deficient number, since it is larger than the sum of its proper divisors (1).

21021111333373 is an equidigital number, since it uses as much as digits as its factorization.

21021111333373 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 6804, while the sum is 31.

Adding to 21021111333373 its reverse (37333311112012), we get a palindrome (58354422445385).

The spelling of 21021111333373 in words is "twenty-one trillion, twenty-one billion, one hundred eleven million, three hundred thirty-three thousand, three hundred seventy-three".