21122020189 has 2 divisors, whose sum is σ = 21122020190. Its totient is φ = 21122020188.

The previous prime is 21122020181. The next prime is 21122020219. The reversal of 21122020189 is 98102022112.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 20983840164 + 138180025 = 144858^2 + 11755^2 .

It is a cyclic number.

It is not a de Polignac number, because 21122020189 - 2³ = 21122020181 is a prime.

It is a super-2 number, since 2×21122020189² (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 (21122020181) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10561010094 + 10561010095.

It is an arithmetic number, because the mean of its divisors is an integer number (10561010095).

Almost surely, 2^21122020189 is an apocalyptic number.

It is an amenable number.

21122020189 is a deficient number, since it is larger than the sum of its proper divisors (1).

21122020189 is an equidigital number, since it uses as much as digits as its factorization.

21122020189 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1152, while the sum is 28.

The spelling of 21122020189 in words is "twenty-one billion, one hundred twenty-two million, twenty thousand, one hundred eighty-nine".