211021112112221 has 8 divisors (see below), whose sum is σ = 216965636297088. Its totient is φ = 205114572108000.

The previous prime is 211021112112199. The next prime is 211021112112313. The reversal of 211021112112221 is 122211211120112.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 211021112112221 - 2¹⁰ = 211021112111197 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 211021112112193 and 211021112112202.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (211021112162221) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9496033895 + ... + 9496056116.

It is an arithmetic number, because the mean of its divisors is an integer number (27120704537136).

Almost surely, 2^{211021112112221} is an apocalyptic number.

It is an amenable number.

211021112112221 is a deficient number, since it is larger than the sum of its proper divisors (5944524184867).

211021112112221 is a wasteful number, since it uses less digits than its factorization.

211021112112221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18992090323.

The product of its (nonzero) digits is 64, while the sum is 20.

Adding to 211021112112221 its reverse (122211211120112), we get a palindrome (333232323232333).

The spelling of 211021112112221 in words is "two hundred eleven trillion, twenty-one billion, one hundred twelve million, one hundred twelve thousand, two hundred twenty-one".