211121210111221 has 8 divisors (see below), whose sum is σ = 218559616614144. Its totient is φ = 203722056413760.

The previous prime is 211121210111179. The next prime is 211121210111257. The reversal of 211121210111221 is 122111012121112.

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 211121210111221 - 2¹⁹ = 211121209586933 is a prime.

It is a super-2 number, since 2×211121210111221² (a number of 29 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (211121210111281) 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, 9813190420 + ... + 9813211933.

It is an arithmetic number, because the mean of its divisors is an integer number (27319952076768).

Almost surely, 2^{211121210111221} is an apocalyptic number.

It is an amenable number.

211121210111221 is a deficient number, since it is larger than the sum of its proper divisors (7438406502923).

211121210111221 is a wasteful number, since it uses less digits than its factorization.

211121210111221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19626402731.

The product of its (nonzero) digits is 32, while the sum is 19.

Adding to 211121210111221 its reverse (122111012121112), we get a palindrome (333232222232333).

The spelling of 211121210111221 in words is "two hundred eleven trillion, one hundred twenty-one billion, two hundred ten million, one hundred eleven thousand, two hundred twenty-one".