211121022211021 has 16 divisors (see below), whose sum is σ = 227457785318400. Its totient is φ = 194798079138240.

The previous prime is 211121022210947. The next prime is 211121022211039. The reversal of 211121022211021 is 120112220121112.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 211121022211021 - 2²⁹ = 211120485340109 is a prime.

It is a super-2 number, since 2×211121022211021² (a number of 29 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 211121022211021.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (211121022211051) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 681269716 + ... + 681579538.

It is an arithmetic number, because the mean of its divisors is an integer number (14216111582400).

Almost surely, 2^{211121022211021} is an apocalyptic number.

It is an amenable number.

211121022211021 is a deficient number, since it is larger than the sum of its proper divisors (16336763107379).

211121022211021 is a wasteful number, since it uses less digits than its factorization.

211121022211021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 331956.

The product of its (nonzero) digits is 64, while the sum is 19.

Adding to 211121022211021 its reverse (120112220121112), we get a palindrome (331233242332133).

The spelling of 211121022211021 in words is "two hundred eleven trillion, one hundred twenty-one billion, twenty-two million, two hundred eleven thousand, twenty-one".