111211210210221 has 24 divisors (see below), whose sum is σ = 176254866025056. Its totient is φ = 67011133835040.

The previous prime is 111211210210211. The next prime is 111211210210229. The reversal of 111211210210221 is 122012012112111.

It is a happy number.

111211210210221 is a `hidden beast` number, since 1 + 1 + 1 + 21 + 1 + 210 + 210 + 221 = 666.

It is not a de Polignac number, because 111211210210221 - 2¹⁸ = 111211209948077 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 111211210210194 and 111211210210203.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (111211210210229) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 3246646335 + ... + 3246680588.

It is an arithmetic number, because the mean of its divisors is an integer number (7343952751044).

Almost surely, 2^{111211210210221} is an apocalyptic number.

111211210210221 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

111211210210221 is a deficient number, since it is larger than the sum of its proper divisors (65043655814835).

111211210210221 is a wasteful number, since it uses less digits than its factorization.

111211210210221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6493327113 (or 6493327110 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 18.

Adding to 111211210210221 its reverse (122012012112111), we get a palindrome (233223222322332).

The spelling of 111211210210221 in words is "one hundred eleven trillion, two hundred eleven billion, two hundred ten million, two hundred ten thousand, two hundred twenty-one".