211121121122221 has 8 divisors (see below), whose sum is σ = 221177990746944. Its totient is φ = 201137392368000.

The previous prime is 211121121122179. The next prime is 211121121122231. The reversal of 211121121122221 is 122221121121112.

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

It is not a de Polignac number, because 211121121122221 - 2²³ = 211121112733613 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 211121121122192 and 211121121122201.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (211121121122231) 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, 18285211716 + ... + 18285223261.

It is an arithmetic number, because the mean of its divisors is an integer number (27647248843368).

Almost surely, 2^{211121121122221} is an apocalyptic number.

It is an amenable number.

211121121122221 is a deficient number, since it is larger than the sum of its proper divisors (10056869624723).

211121121122221 is a wasteful number, since it uses less digits than its factorization.

211121121122221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 36570435251.

The product of its digits is 128, while the sum is 22.

Adding to 211121121122221 its reverse (122221121121112), we get a palindrome (333342242243333).

The spelling of 211121121122221 in words is "two hundred eleven trillion, one hundred twenty-one billion, one hundred twenty-one million, one hundred twenty-two thousand, two hundred twenty-one".