1221219742 has 8 divisors (see below), whose sum is σ = 1833300000. Its totient is φ = 610119744.

The previous prime is 1221219733. The next prime is 1221219749. The reversal of 1221219742 is 2479121221.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1221219749) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 241942 + ... + 246937.

It is an arithmetic number, because the mean of its divisors is an integer number (229162500).

Almost surely, 2^1221219742 is an apocalyptic number.

1221219742 is a deficient number, since it is larger than the sum of its proper divisors (612080258).

1221219742 is a wasteful number, since it uses less digits than its factorization.

1221219742 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 490130.

The product of its digits is 4032, while the sum is 31.

The square root of 1221219742 is about 34945.9545870477. The cubic root of 1221219742 is about 1068.8857127936.

The spelling of 1221219742 in words is "one billion, two hundred twenty-one million, two hundred nineteen thousand, seven hundred forty-two".