211211121111021 has 16 divisors (see below), whose sum is σ = 316003437529920. Its totient is φ = 139413281259600.

The previous prime is 211211121111019. The next prime is 211211121111047. The reversal of 211211121111021 is 120111121112112.

211211121111021 is a `hidden beast` number, since 211 + 2 + 111 + 211 + 110 + 21 = 666.

It is not a de Polignac number, because 211211121111021 - 2¹ = 211211121111019 is a prime.

It is a super-2 number, since 2×211211121111021² (a number of 29 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 211211121110985 and 211211121111003.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (211211121115021) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 38725908735 + ... + 38725914188.

It is an arithmetic number, because the mean of its divisors is an integer number (19750214845620).

Almost surely, 2^{211211121111021} is an apocalyptic number.

It is an amenable number.

211211121111021 is a deficient number, since it is larger than the sum of its proper divisors (104792316418899).

211211121111021 is a wasteful number, since it uses less digits than its factorization.

211211121111021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 77451823033 (or 77451823027 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 18.

Adding to 211211121111021 its reverse (120111121112112), we get a palindrome (331322242223133).

The spelling of 211211121111021 in words is "two hundred eleven trillion, two hundred eleven billion, one hundred twenty-one million, one hundred eleven thousand, twenty-one".