211112220202021 has 2 divisors, whose sum is σ = 211112220202022. Its totient is φ = 211112220202020.

The previous prime is 211112220202003. The next prime is 211112220202087. The reversal of 211112220202021 is 120202022211112.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 210896877799521 + 215342402500 = 14522289^2 + 464050^2 .

It is a cyclic number.

It is not a de Polignac number, because 211112220202021 - 2¹³ = 211112220193829 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 211112220202021.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (211112220202321) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 105556110101010 + 105556110101011.

It is an arithmetic number, because the mean of its divisors is an integer number (105556110101011).

Almost surely, 2^{211112220202021} is an apocalyptic number.

It is an amenable number.

211112220202021 is a deficient number, since it is larger than the sum of its proper divisors (1).

211112220202021 is an equidigital number, since it uses as much as digits as its factorization.

211112220202021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 128, while the sum is 19.

Adding to 211112220202021 its reverse (120202022211112), we get a palindrome (331314242413133).

The spelling of 211112220202021 in words is "two hundred eleven trillion, one hundred twelve billion, two hundred twenty million, two hundred two thousand, twenty-one".