212021011109 has 2 divisors, whose sum is σ = 212021011110. Its totient is φ = 212021011108.

The previous prime is 212021011099. The next prime is 212021011151. The reversal of 212021011109 is 901110120212.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 124271760484 + 87749250625 = 352522^2 + 296225^2 .

It is a cyclic number.

It is not a de Polignac number, because 212021011109 - 2⁸ = 212021010853 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (212021019109) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 106010505554 + 106010505555.

It is an arithmetic number, because the mean of its divisors is an integer number (106010505555).

Almost surely, 2^212021011109 is an apocalyptic number.

It is an amenable number.

212021011109 is a deficient number, since it is larger than the sum of its proper divisors (1).

212021011109 is an equidigital number, since it uses as much as digits as its factorization.

212021011109 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 72, while the sum is 20.

The spelling of 212021011109 in words is "two hundred twelve billion, twenty-one million, eleven thousand, one hundred nine".