1221133342 has 64 divisors (see below), whose sum is σ = 2277144576. Its totient is φ = 483183360.

The previous prime is 1221133313. The next prime is 1221133351. The reversal of 1221133342 is 2433311221.

It is a Harshad number since it is a multiple of its sum of digits (22).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 478923 + ... + 481465.

It is an arithmetic number, because the mean of its divisors is an integer number (35580384).

Almost surely, 2^1221133342 is an apocalyptic number.

1221133342 is a deficient number, since it is larger than the sum of its proper divisors (1056011234).

1221133342 is a wasteful number, since it uses less digits than its factorization.

1221133342 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2665.

The product of its digits is 864, while the sum is 22.

The square root of 1221133342 is about 34944.7183705921. The cubic root of 1221133342 is about 1068.8605046893.

Adding to 1221133342 its reverse (2433311221), we get a palindrome (3654444563).

The spelling of 1221133342 in words is "one billion, two hundred twenty-one million, one hundred thirty-three thousand, three hundred forty-two".