21122221937 has 2 divisors, whose sum is σ = 21122221938. Its totient is φ = 21122221936.

The previous prime is 21122221927. The next prime is 21122221961. The reversal of 21122221937 is 73912222112.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 15781389376 + 5340832561 = 125624^2 + 73081^2 .

It is a cyclic number.

It is not a de Polignac number, because 21122221937 - 2⁴ = 21122221921 is a prime.

It is a super-2 number, since 2×21122221937² (a number of 21 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (21122221927) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10561110968 + 10561110969.

It is an arithmetic number, because the mean of its divisors is an integer number (10561110969).

Almost surely, 2^21122221937 is an apocalyptic number.

It is an amenable number.

21122221937 is a deficient number, since it is larger than the sum of its proper divisors (1).

21122221937 is an equidigital number, since it uses as much as digits as its factorization.

21122221937 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 6048, while the sum is 32.

The spelling of 21122221937 in words is "twenty-one billion, one hundred twenty-two million, two hundred twenty-one thousand, nine hundred thirty-seven".