221211220311 has 12 divisors (see below), whose sum is σ = 319633056288. Its totient is φ = 147425344704.

The previous prime is 221211220309. The next prime is 221211220337. The reversal of 221211220311 is 113022112122.

221211220311 is a `hidden beast` number, since 221 + 2 + 112 + 20 + 311 = 666.

It is not a de Polignac number, because 221211220311 - 2¹ = 221211220309 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221211220301) 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, 4038130 + ... + 4092543.

It is an arithmetic number, because the mean of its divisors is an integer number (26636088024).

Almost surely, 2^221211220311 is an apocalyptic number.

221211220311 is a deficient number, since it is larger than the sum of its proper divisors (98421835977).

221211220311 is a wasteful number, since it uses less digits than its factorization.

221211220311 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8133702 (or 8133699 counting only the distinct ones).

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

Adding to 221211220311 its reverse (113022112122), we get a palindrome (334233332433).

The spelling of 221211220311 in words is "two hundred twenty-one billion, two hundred eleven million, two hundred twenty thousand, three hundred eleven".