1221373042 has 8 divisors (see below), whose sum is σ = 1863111600. Its totient is φ = 600335844.

The previous prime is 1221373039. The next prime is 1221373051. The reversal of 1221373042 is 2403731221.

It is a happy number.

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

It is a junction number, because it is equal to n+sod(n) for n = 1221372998 and 1221373016.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5175192 + ... + 5175427.

It is an arithmetic number, because the mean of its divisors is an integer number (232888950).

Almost surely, 2^1221373042 is an apocalyptic number.

1221373042 is a deficient number, since it is larger than the sum of its proper divisors (641738558).

1221373042 is a wasteful number, since it uses less digits than its factorization.

1221373042 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10350680.

The product of its (nonzero) digits is 2016, while the sum is 25.

The square root of 1221373042 is about 34948.1479051466. The cubic root of 1221373042 is about 1068.9304367468.

The spelling of 1221373042 in words is "one billion, two hundred twenty-one million, three hundred seventy-three thousand, forty-two".