21023321273 has 2 divisors, whose sum is σ = 21023321274. Its totient is φ = 21023321272.

The previous prime is 21023321237. The next prime is 21023321309. The reversal of 21023321273 is 37212332012.

It is a happy number.

Together with previous prime (21023321237) it forms an Ormiston pair, because they use the same digits, order apart.

It is a balanced prime because it is at equal distance from previous prime (21023321237) and next prime (21023321309).

It can be written as a sum of positive squares in only one way, i.e., 20103836944 + 919484329 = 141788^2 + 30323^2 .

It is a cyclic number.

It is not a de Polignac number, because 21023321273 - 2¹² = 21023317177 is a prime.

It is not a weakly prime, because it can be changed into another prime (21023321203) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10511660636 + 10511660637.

It is an arithmetic number, because the mean of its divisors is an integer number (10511660637).

Almost surely, 2^21023321273 is an apocalyptic number.

It is an amenable number.

21023321273 is a deficient number, since it is larger than the sum of its proper divisors (1).

21023321273 is an equidigital number, since it uses as much as digits as its factorization.

21023321273 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3024, while the sum is 26.

Adding to 21023321273 its reverse (37212332012), we get a palindrome (58235653285).

The spelling of 21023321273 in words is "twenty-one billion, twenty-three million, three hundred twenty-one thousand, two hundred seventy-three".