211222102201021 has 4 divisors (see below), whose sum is σ = 211230910118844. Its totient is φ = 211213294283200.

The previous prime is 211222102201009. The next prime is 211222102201027. The reversal of 211222102201021 is 120102201222112.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 515423484900 + 210706678716121 = 717930^2 + 14515739^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-211222102201021 is a prime.

It is a super-2 number, since 2×211222102201021² (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 211222102201021.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (211222102201027) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4403922940 + ... + 4403970901.

It is an arithmetic number, because the mean of its divisors is an integer number (52807727529711).

Almost surely, 2^{211222102201021} is an apocalyptic number.

It is an amenable number.

211222102201021 is a deficient number, since it is larger than the sum of its proper divisors (8807917823).

211222102201021 is an equidigital number, since it uses as much as digits as its factorization.

211222102201021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8807917822.

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

Adding to 211222102201021 its reverse (120102201222112), we get a palindrome (331324303423133).

The spelling of 211222102201021 in words is "two hundred eleven trillion, two hundred twenty-two billion, one hundred two million, two hundred one thousand, twenty-one".