211121012221 has 8 divisors (see below), whose sum is σ = 247166063424. Its totient is φ = 176547187680.

The previous prime is 211121012147. The next prime is 211121012273. The reversal of 211121012221 is 122210121112.

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 211121012221 - 2¹⁵ = 211120979453 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 211121012195 and 211121012204.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (211121012621) 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, 367806355 + ... + 367806928.

It is an arithmetic number, because the mean of its divisors is an integer number (30895757928).

Almost surely, 2^211121012221 is an apocalyptic number.

It is an amenable number.

211121012221 is a deficient number, since it is larger than the sum of its proper divisors (36045051203).

211121012221 is an equidigital number, since it uses as much as digits as its factorization.

211121012221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 735613331.

The product of its (nonzero) digits is 32, while the sum is 16.

Adding to 211121012221 its reverse (122210121112), we get a palindrome (333331133333).

The spelling of 211121012221 in words is "two hundred eleven billion, one hundred twenty-one million, twelve thousand, two hundred twenty-one".