211120200011221 has 4 divisors (see below), whose sum is σ = 212464914661132. Its totient is φ = 209775485361312.

The previous prime is 211120200011213. The next prime is 211120200011239. The reversal of 211120200011221 is 122110002021112.

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 69942696080625 + 141177503930596 = 8363175^2 + 11881814^2 .

It is a cyclic number.

It is not a de Polignac number, because 211120200011221 - 2³ = 211120200011213 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 211120200011195 and 211120200011204.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (211120200011621) 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, 672357324720 + ... + 672357325033.

It is an arithmetic number, because the mean of its divisors is an integer number (53116228665283).

Almost surely, 2^{211120200011221} is an apocalyptic number.

It is an amenable number.

211120200011221 is a deficient number, since it is larger than the sum of its proper divisors (1344714649911).

211120200011221 is a wasteful number, since it uses less digits than its factorization.

211120200011221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1344714649910.

The product of its (nonzero) digits is 32, while the sum is 16.

Adding to 211120200011221 its reverse (122110002021112), we get a palindrome (333230202032333).

The spelling of 211120200011221 in words is "two hundred eleven trillion, one hundred twenty billion, two hundred million, eleven thousand, two hundred twenty-one".