21065902373 has 2 divisors, whose sum is σ = 21065902374. Its totient is φ = 21065902372.

The previous prime is 21065902367. The next prime is 21065902379. The reversal of 21065902373 is 37320956012.

It is a balanced prime because it is at equal distance from previous prime (21065902367) and next prime (21065902379).

It can be written as a sum of positive squares in only one way, i.e., 15071736289 + 5994166084 = 122767^2 + 77422^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21065902373 is a prime.

It is a super-2 number, since 2×21065902373² (a number of 21 digits) contains 22 as substring.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21065902379) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10532951186 + 10532951187.

It is an arithmetic number, because the mean of its divisors is an integer number (10532951187).

Almost surely, 2^21065902373 is an apocalyptic number.

It is an amenable number.

21065902373 is a deficient number, since it is larger than the sum of its proper divisors (1).

21065902373 is an equidigital number, since it uses as much as digits as its factorization.

21065902373 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 68040, while the sum is 38.

The spelling of 21065902373 in words is "twenty-one billion, sixty-five million, nine hundred two thousand, three hundred seventy-three".