1221130342 has 32 divisors (see below), whose sum is σ = 1965254400. Its totient is φ = 567360288.

The previous prime is 1221130333. The next prime is 1221130343. The reversal of 1221130342 is 2430311221.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (19).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1221130343) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 683983 + ... + 685765.

It is an arithmetic number, because the mean of its divisors is an integer number (61414200).

Almost surely, 2^1221130342 is an apocalyptic number.

1221130342 is a deficient number, since it is larger than the sum of its proper divisors (744124058).

1221130342 is a wasteful number, since it uses less digits than its factorization.

1221130342 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2140.

The product of its (nonzero) digits is 288, while the sum is 19.

The square root of 1221130342 is about 34944.6754456240. The cubic root of 1221130342 is about 1068.8596293866.

Adding to 1221130342 its reverse (2430311221), we get a palindrome (3651441563).

The spelling of 1221130342 in words is "one billion, two hundred twenty-one million, one hundred thirty thousand, three hundred forty-two".