211212220102021 has 8 divisors (see below), whose sum is σ = 212135390512280. Its totient is φ = 210289057051392.

The previous prime is 211212220102019. The next prime is 211212220102063. The reversal of 211212220102021 is 120201022212112.

It can be written as a sum of positive squares in 4 ways, for example, as 15009727829121 + 196202492272900 = 3874239^2 + 14007230^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 211212220102021 - 2¹ = 211212220102019 is a prime.

It is a super-2 number, since 2×211212220102021² (a number of 29 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 211212220102021.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (211212220102001) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 60252121 + ... + 63661153.

It is an arithmetic number, because the mean of its divisors is an integer number (26516923814035).

Almost surely, 2^{211212220102021} is an apocalyptic number.

It is an amenable number.

211212220102021 is a deficient number, since it is larger than the sum of its proper divisors (923170410259).

211212220102021 is a wasteful number, since it uses less digits than its factorization.

211212220102021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3679815.

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

Adding to 211212220102021 its reverse (120201022212112), we get a palindrome (331413242314133).

The spelling of 211212220102021 in words is "two hundred eleven trillion, two hundred twelve billion, two hundred twenty million, one hundred two thousand, twenty-one".