1210111221 has 32 divisors (see below), whose sum is σ = 1866240000. Its totient is φ = 689319680.

The previous prime is 1210111193. The next prime is 1210111247. The reversal of 1210111221 is 1221110121.

It is a cyclic number.

It is not a de Polignac number, because 1210111221 - 2⁷ = 1210111093 is a prime.

It is a super-2 number, since 2×1210111221² = 2928738334380221682, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 1210111197 and 1210111206.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1210111271) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 806530 + ... + 808028.

It is an arithmetic number, because the mean of its divisors is an integer number (58320000).

Almost surely, 2^1210111221 is an apocalyptic number.

1210111221 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1210111221 is a deficient number, since it is larger than the sum of its proper divisors (656128779).

1210111221 is a wasteful number, since it uses less digits than its factorization.

1210111221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2969.

The product of its (nonzero) digits is 8, while the sum is 12.

The square root of 1210111221 is about 34786.6529145878. The cubic root of 1210111221 is about 1065.6348851730.

Adding to 1210111221 its reverse (1221110121), we get a palindrome (2431221342).

The spelling of 1210111221 in words is "one billion, two hundred ten million, one hundred eleven thousand, two hundred twenty-one".