1221242110 has 24 divisors (see below), whose sum is σ = 2416245048. Its totient is φ = 444087600.

The previous prime is 1221242101. The next prime is 1221242111. The reversal of 1221242110 is 112421221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1221242111) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 503436 + ... + 505855.

It is an arithmetic number, because the mean of its divisors is an integer number (100676877).

Almost surely, 2^1221242110 is an apocalyptic number.

1221242110 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1221242110 is a deficient number, since it is larger than the sum of its proper divisors (1195002938).

1221242110 is a wasteful number, since it uses less digits than its factorization.

1221242110 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1009320 (or 1009309 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 16.

The square root of 1221242110 is about 34946.2746226261. The cubic root of 1221242110 is about 1068.8922386979.

Adding to 1221242110 its reverse (112421221), we get a palindrome (1333663331).

The spelling of 1221242110 in words is "one billion, two hundred twenty-one million, two hundred forty-two thousand, one hundred ten".