211200122021221 has 4 divisors (see below), whose sum is σ = 211201939022112. Its totient is φ = 211198305020332.

The previous prime is 211200122021219. The next prime is 211200122021249. The reversal of 211200122021221 is 122120221002112.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 211200122021221 - 2¹ = 211200122021219 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (211200122021281) 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, 908326081 + ... + 908558566.

It is an arithmetic number, because the mean of its divisors is an integer number (52800484755528).

Almost surely, 2^{211200122021221} is an apocalyptic number.

It is an amenable number.

211200122021221 is a deficient number, since it is larger than the sum of its proper divisors (1817000891).

211200122021221 is a wasteful number, since it uses less digits than its factorization.

211200122021221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1817000890.

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

Adding to 211200122021221 its reverse (122120221002112), we get a palindrome (333320343023333).

The spelling of 211200122021221 in words is "two hundred eleven trillion, two hundred billion, one hundred twenty-two million, twenty-one thousand, two hundred twenty-one".