211213423221 has 16 divisors (see below), whose sum is σ = 313877534400. Its totient is φ = 125551012608.

The previous prime is 211213423217. The next prime is 211213423247. The reversal of 211213423221 is 122324312112.

It is not a de Polignac number, because 211213423221 - 2² = 211213423217 is a prime.

It is a super-2 number, since 2×211213423221² (a number of 23 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 211213423191 and 211213423200.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (211213423271) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 108984286 + ... + 108986223.

It is an arithmetic number, because the mean of its divisors is an integer number (19617345900).

Almost surely, 2^211213423221 is an apocalyptic number.

It is an amenable number.

211213423221 is a deficient number, since it is larger than the sum of its proper divisors (102664111179).

211213423221 is a wasteful number, since it uses less digits than its factorization.

211213423221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 217970548.

The product of its digits is 1152, while the sum is 24.

Adding to 211213423221 its reverse (122324312112), we get a palindrome (333537735333).

The spelling of 211213423221 in words is "two hundred eleven billion, two hundred thirteen million, four hundred twenty-three thousand, two hundred twenty-one".