1221224142 has 16 divisors (see below), whose sum is σ = 2478903552. Its totient is φ = 400998840.

The previous prime is 1221224141. The next prime is 1221224153. The reversal of 1221224142 is 2414221221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1221224141) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1518534 + ... + 1519337.

It is an arithmetic number, because the mean of its divisors is an integer number (154931472).

Almost surely, 2^1221224142 is an apocalyptic number.

1221224142 is an abundant number, since it is smaller than the sum of its proper divisors (1257679410).

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

1221224142 is a wasteful number, since it uses less digits than its factorization.

1221224142 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3037943.

The product of its digits is 512, while the sum is 21.

The square root of 1221224142 is about 34946.0175413451. The cubic root of 1221224142 is about 1068.8869965078.

Adding to 1221224142 its reverse (2414221221), we get a palindrome (3635445363).

The spelling of 1221224142 in words is "one billion, two hundred twenty-one million, two hundred twenty-four thousand, one hundred forty-two".