211021213221 has 48 divisors (see below), whose sum is σ = 385288036224. Its totient is φ = 108299555712.

The previous prime is 211021213201. The next prime is 211021213237. The reversal of 211021213221 is 122312120112.

211021213221 is a `hidden beast` number, since 211 + 0 + 21 + 213 + 221 = 666.

It is not a de Polignac number, because 211021213221 - 2⁷ = 211021213093 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 211021213194 and 211021213203.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (211021213201) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 3451551 + ... + 3512156.

It is an arithmetic number, because the mean of its divisors is an integer number (8026834088).

Almost surely, 2^211021213221 is an apocalyptic number.

211021213221 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

211021213221 is a deficient number, since it is larger than the sum of its proper divisors (174266823003).

211021213221 is a wasteful number, since it uses less digits than its factorization.

211021213221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6963770 (or 6963767 counting only the distinct ones).

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

Adding to 211021213221 its reverse (122312120112), we get a palindrome (333333333333).

The spelling of 211021213221 in words is "two hundred eleven billion, twenty-one million, two hundred thirteen thousand, two hundred twenty-one".