111221010 has 24 divisors (see below), whose sum is σ = 289174860. Its totient is φ = 29658912.

The previous prime is 111220999. The next prime is 111221023. The reversal of 111221010 is 10122111.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 110061081 + 1159929 = 10491^2 + 1077^2 .

It is a super-2 number, since 2×111221010² = 24740226130840200, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (9).

It is a junction number, because it is equal to n+sod(n) for n = 111220983 and 111221001.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 617805 + ... + 617984.

Almost surely, 2^111221010 is an apocalyptic number.

111221010 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

111221010 is an abundant number, since it is smaller than the sum of its proper divisors (177953850).

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

111221010 is a wasteful number, since it uses less digits than its factorization.

111221010 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1235802 (or 1235799 counting only the distinct ones).

The product of its (nonzero) digits is 4, while the sum is 9.

The square root of 111221010 is about 10546.1372075277. The cubic root of 111221010 is about 480.9083061657.

Adding to 111221010 its reverse (10122111), we get a palindrome (121343121).

It can be divided in two parts, 1112 and 21010, that added together give a palindrome (22122).

The spelling of 111221010 in words is "one hundred eleven million, two hundred twenty-one thousand, ten".