212021112109 has 2 divisors, whose sum is σ = 212021112110. Its totient is φ = 212021112108.

The previous prime is 212021112071. The next prime is 212021112133. The reversal of 212021112109 is 901211120212.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 133281946084 + 78739166025 = 365078^2 + 280605^2 .

It is a cyclic number.

It is not a de Polignac number, because 212021112109 - 2¹¹ = 212021110061 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 212021112109.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (212021112139) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 106010556054 + 106010556055.

It is an arithmetic number, because the mean of its divisors is an integer number (106010556055).

Almost surely, 2^212021112109 is an apocalyptic number.

It is an amenable number.

212021112109 is a deficient number, since it is larger than the sum of its proper divisors (1).

212021112109 is an equidigital number, since it uses as much as digits as its factorization.

212021112109 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 144, while the sum is 22.

It can be divided in two parts, 21202 and 1112109, that added together give a palindrome (1133311).

The spelling of 212021112109 in words is "two hundred twelve billion, twenty-one million, one hundred twelve thousand, one hundred nine".