211211214221 has 8 divisors (see below), whose sum is σ = 241934098560. Its totient is φ = 180625793328.

The previous prime is 211211214217. The next prime is 211211214223. The reversal of 211211214221 is 122412112112.

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 211211214221 - 2² = 211211214217 is a prime.

It is a super-2 number, since 2×211211214221² (a number of 23 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 211211214193 and 211211214202.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (211211214223) 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, 34362566 + ... + 34368711.

It is an arithmetic number, because the mean of its divisors is an integer number (30241762320).

Almost surely, 2^211211214221 is an apocalyptic number.

It is an amenable number.

211211214221 is a deficient number, since it is larger than the sum of its proper divisors (30722884339).

211211214221 is an equidigital number, since it uses as much as digits as its factorization.

211211214221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 68731723.

The product of its digits is 128, while the sum is 20.

Adding to 211211214221 its reverse (122412112112), we get a palindrome (333623326333).

The spelling of 211211214221 in words is "two hundred eleven billion, two hundred eleven million, two hundred fourteen thousand, two hundred twenty-one".