21022331173 has 2 divisors, whose sum is σ = 21022331174. Its totient is φ = 21022331172.

The previous prime is 21022331171. The next prime is 21022331203. The reversal of 21022331173 is 37113322012.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 20396981124 + 625350049 = 142818^2 + 25007^2 .

It is a cyclic number.

It is not a de Polignac number, because 21022331173 - 2¹ = 21022331171 is a prime.

Together with 21022331171, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21022331171) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10511165586 + 10511165587.

It is an arithmetic number, because the mean of its divisors is an integer number (10511165587).

Almost surely, 2^21022331173 is an apocalyptic number.

It is an amenable number.

21022331173 is a deficient number, since it is larger than the sum of its proper divisors (1).

21022331173 is an equidigital number, since it uses as much as digits as its factorization.

21022331173 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1512, while the sum is 25.

Adding to 21022331173 its reverse (37113322012), we get a palindrome (58135653185).

The spelling of 21022331173 in words is "twenty-one billion, twenty-two million, three hundred thirty-one thousand, one hundred seventy-three".