211320121 has 4 divisors (see below), whose sum is σ = 212719744. Its totient is φ = 209920500.

The previous prime is 211320119. The next prime is 211320143. The reversal of 211320121 is 121023112.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 211320121 - 2¹ = 211320119 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (211320721) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 699585 + ... + 699886.

It is an arithmetic number, because the mean of its divisors is an integer number (53179936).

Almost surely, 2^211320121 is an apocalyptic number.

It is an amenable number.

211320121 is a deficient number, since it is larger than the sum of its proper divisors (1399623).

211320121 is a wasteful number, since it uses less digits than its factorization.

211320121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1399622.

The product of its (nonzero) digits is 24, while the sum is 13.

The square root of 211320121 is about 14536.8538893393. The cubic root of 211320121 is about 595.6351018114.

Adding to 211320121 its reverse (121023112), we get a palindrome (332343233).

The spelling of 211320121 in words is "two hundred eleven million, three hundred twenty thousand, one hundred twenty-one".