21122001071 has 2 divisors, whose sum is σ = 21122001072. Its totient is φ = 21122001070.

The previous prime is 21122001059. The next prime is 21122001139. The reversal of 21122001071 is 17010022112.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21122001071 - 2⁶ = 21122001007 is a prime.

It is a super-2 number, since 2×21122001071² (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 (21122001031) 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, 10561000535 + 10561000536.

It is an arithmetic number, because the mean of its divisors is an integer number (10561000536).

Almost surely, 2^21122001071 is an apocalyptic number.

21122001071 is a deficient number, since it is larger than the sum of its proper divisors (1).

21122001071 is an equidigital number, since it uses as much as digits as its factorization.

21122001071 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 56, while the sum is 17.

Adding to 21122001071 its reverse (17010022112), we get a palindrome (38132023183).

The spelling of 21122001071 in words is "twenty-one billion, one hundred twenty-two million, one thousand, seventy-one".