21122122237 has 2 divisors, whose sum is σ = 21122122238. Its totient is φ = 21122122236.

The previous prime is 21122122193. The next prime is 21122122261. The reversal of 21122122237 is 73222122112.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 18307713636 + 2814408601 = 135306^2 + 53051^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21122122237 is a prime.

It is a super-2 number, since 2×21122122237² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21122122037) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10561061118 + 10561061119.

It is an arithmetic number, because the mean of its divisors is an integer number (10561061119).

Almost surely, 2^21122122237 is an apocalyptic number.

It is an amenable number.

21122122237 is a deficient number, since it is larger than the sum of its proper divisors (1).

21122122237 is an equidigital number, since it uses as much as digits as its factorization.

21122122237 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1344, while the sum is 25.

Adding to 21122122237 its reverse (73222122112), we get a palindrome (94344244349).

The spelling of 21122122237 in words is "twenty-one billion, one hundred twenty-two million, one hundred twenty-two thousand, two hundred thirty-seven".