1210221111 has 32 divisors (see below), whose sum is σ = 1812400128. Its totient is φ = 711980640.

The previous prime is 1210221101. The next prime is 1210221113. The reversal of 1210221111 is 1111220121.

It is not a de Polignac number, because 1210221111 - 2⁷ = 1210220983 is a prime.

It is a super-4 number, since 4×1210221111⁴ (a number of 37 digits) contains 4444 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1210221113) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 234420 + ... + 239526.

It is an arithmetic number, because the mean of its divisors is an integer number (56637504).

Almost surely, 2^1210221111 is an apocalyptic number.

1210221111 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

1210221111 is a deficient number, since it is larger than the sum of its proper divisors (602179017).

1210221111 is a wasteful number, since it uses less digits than its factorization.

1210221111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5331.

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

The square root of 1210221111 is about 34788.2323638325. The cubic root of 1210221111 is about 1065.6671409059.

Adding to 1210221111 its reverse (1111220121), we get a palindrome (2321441232).

The spelling of 1210221111 in words is "one billion, two hundred ten million, two hundred twenty-one thousand, one hundred eleven".