22721764237 has 2 divisors, whose sum is σ = 22721764238. Its totient is φ = 22721764236.

The previous prime is 22721764223. The next prime is 22721764313. The reversal of 22721764237 is 73246712722.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 22580772361 + 140991876 = 150269^2 + 11874^2 .

It is a cyclic number.

It is not a de Polignac number, because 22721764237 - 2³¹ = 20574280589 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 22721764193 and 22721764202.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (22721774237) 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, 11360882118 + 11360882119.

It is an arithmetic number, because the mean of its divisors is an integer number (11360882119).

Almost surely, 2^22721764237 is an apocalyptic number.

It is an amenable number.

22721764237 is a deficient number, since it is larger than the sum of its proper divisors (1).

22721764237 is an equidigital number, since it uses as much as digits as its factorization.

22721764237 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 395136, while the sum is 43.

The spelling of 22721764237 in words is "twenty-two billion, seven hundred twenty-one million, seven hundred sixty-four thousand, two hundred thirty-seven".