21210222073 has 2 divisors, whose sum is σ = 21210222074. Its totient is φ = 21210222072.

The previous prime is 21210222031. The next prime is 21210222113. The reversal of 21210222073 is 37022201212.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 11059256569 + 10150965504 = 105163^2 + 100752^2 .

It is a cyclic number.

It is not a de Polignac number, because 21210222073 - 2¹³ = 21210213881 is a prime.

It is not a weakly prime, because it can be changed into another prime (21210222013) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10605111036 + 10605111037.

It is an arithmetic number, because the mean of its divisors is an integer number (10605111037).

Almost surely, 2^21210222073 is an apocalyptic number.

It is an amenable number.

21210222073 is a deficient number, since it is larger than the sum of its proper divisors (1).

21210222073 is an equidigital number, since it uses as much as digits as its factorization.

21210222073 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 672, while the sum is 22.

Adding to 21210222073 its reverse (37022201212), we get a palindrome (58232423285).

The spelling of 21210222073 in words is "twenty-one billion, two hundred ten million, two hundred twenty-two thousand, seventy-three".