21220002073 has 2 divisors, whose sum is σ = 21220002074. Its totient is φ = 21220002072.

The previous prime is 21220002043. The next prime is 21220002113. The reversal of 21220002073 is 37020002212.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 13974076944 + 7245925129 = 118212^2 + 85123^2 .

It is a cyclic number.

It is not a de Polignac number, because 21220002073 - 2²¹ = 21217904921 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 21220002073.

It is not a weakly prime, because it can be changed into another prime (21220002043) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10610001036 + 10610001037.

It is an arithmetic number, because the mean of its divisors is an integer number (10610001037).

Almost surely, 2^21220002073 is an apocalyptic number.

It is an amenable number.

21220002073 is a deficient number, since it is larger than the sum of its proper divisors (1).

21220002073 is an equidigital number, since it uses as much as digits as its factorization.

21220002073 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 336, while the sum is 19.

Adding to 21220002073 its reverse (37020002212), we get a palindrome (58240004285).

The spelling of 21220002073 in words is "twenty-one billion, two hundred twenty million, two thousand, seventy-three".