21222722237 has 2 divisors, whose sum is σ = 21222722238. Its totient is φ = 21222722236.

The previous prime is 21222722177. The next prime is 21222722243. The reversal of 21222722237 is 73222722212.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 18632523001 + 2590199236 = 136501^2 + 50894^2 .

It is a cyclic number.

It is not a de Polignac number, because 21222722237 - 2¹⁴ = 21222705853 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21224722237) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10611361118 + 10611361119.

It is an arithmetic number, because the mean of its divisors is an integer number (10611361119).

Almost surely, 2^21222722237 is an apocalyptic number.

It is an amenable number.

21222722237 is a deficient number, since it is larger than the sum of its proper divisors (1).

21222722237 is an equidigital number, since it uses as much as digits as its factorization.

21222722237 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 18816, while the sum is 32.

The spelling of 21222722237 in words is "twenty-one billion, two hundred twenty-two million, seven hundred twenty-two thousand, two hundred thirty-seven".