21331322010073 has 2 divisors, whose sum is σ = 21331322010074. Its totient is φ = 21331322010072.

The previous prime is 21331322010071. The next prime is 21331322010079. The reversal of 21331322010073 is 37001022313312.

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., 13420001342224 + 7911320667849 = 3663332^2 + 2812707^2 .

It is a cyclic number.

It is not a de Polignac number, because 21331322010073 - 2¹ = 21331322010071 is a prime.

It is a super-2 number, since 2×21331322010073² (a number of 27 digits) contains 22 as substring.

Together with 21331322010071, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (21331322010071) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10665661005036 + 10665661005037.

It is an arithmetic number, because the mean of its divisors is an integer number (10665661005037).

Almost surely, 2^{21331322010073} is an apocalyptic number.

It is an amenable number.

21331322010073 is a deficient number, since it is larger than the sum of its proper divisors (1).

21331322010073 is an equidigital number, since it uses as much as digits as its factorization.

21331322010073 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4536, while the sum is 28.

Adding to 21331322010073 its reverse (37001022313312), we get a palindrome (58332344323385).

The spelling of 21331322010073 in words is "twenty-one trillion, three hundred thirty-one billion, three hundred twenty-two million, ten thousand, seventy-three".