211220221326 has 96 divisors (see below), whose sum is σ = 449142599808. Its totient is φ = 66209832000.

The previous prime is 211220221301. The next prime is 211220221327. The reversal of 211220221326 is 623122022112.

It is a super-2 number, since 2×211220221326² (a number of 23 digits) contains 22 as substring.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 211220221296 and 211220221305.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (211220221327) 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, 240843600 + ... + 240844476.

It is an arithmetic number, because the mean of its divisors is an integer number (4678568748).

Almost surely, 2^211220221326 is an apocalyptic number.

211220221326 is an abundant number, since it is smaller than the sum of its proper divisors (237922378482).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

211220221326 is a wasteful number, since it uses less digits than its factorization.

211220221326 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1614 (or 1595 counting only the distinct ones).

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

Adding to 211220221326 its reverse (623122022112), we get a palindrome (834342243438).

The spelling of 211220221326 in words is "two hundred eleven billion, two hundred twenty million, two hundred twenty-one thousand, three hundred twenty-six".