211210213221 has 12 divisors (see below), whose sum is σ = 348664479072. Its totient is φ = 120691550376.

The previous prime is 211210213211. The next prime is 211210213231. The reversal of 211210213221 is 122312012112.

211210213221 is a `hidden beast` number, since 21 + 1 + 210 + 213 + 221 = 666.

It is an interprime number because it is at equal distance from previous prime (211210213211) and next prime (211210213231).

It is not a de Polignac number, because 211210213221 - 2⁶ = 211210213157 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 211210213194 and 211210213203.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (211210213211) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1676271471 + ... + 1676271596.

It is an arithmetic number, because the mean of its divisors is an integer number (29055373256).

Almost surely, 2^211210213221 is an apocalyptic number.

211210213221 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

211210213221 is a deficient number, since it is larger than the sum of its proper divisors (137454265851).

211210213221 is a wasteful number, since it uses less digits than its factorization.

211210213221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3352543080 (or 3352543077 counting only the distinct ones).

The product of its (nonzero) digits is 96, while the sum is 18.

Adding to 211210213221 its reverse (122312012112), we get a palindrome (333522225333).

The spelling of 211210213221 in words is "two hundred eleven billion, two hundred ten million, two hundred thirteen thousand, two hundred twenty-one".