21122160197 has 2 divisors, whose sum is σ = 21122160198. Its totient is φ = 21122160196.

The previous prime is 21122160149. The next prime is 21122160203. The reversal of 21122160197 is 79106122112.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 13003068961 + 8119091236 = 114031^2 + 90106^2 .

It is a cyclic number.

It is not a de Polignac number, because 21122160197 - 2⁶ = 21122160133 is a prime.

It is a super-2 number, since 2×21122160197² (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 (21122160127) 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, 10561080098 + 10561080099.

It is an arithmetic number, because the mean of its divisors is an integer number (10561080099).

Almost surely, 2^21122160197 is an apocalyptic number.

It is an amenable number.

21122160197 is a deficient number, since it is larger than the sum of its proper divisors (1).

21122160197 is an equidigital number, since it uses as much as digits as its factorization.

21122160197 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3024, while the sum is 32.

The spelling of 21122160197 in words is "twenty-one billion, one hundred twenty-two million, one hundred sixty thousand, one hundred ninety-seven".