1221310342 has 16 divisors (see below), whose sum is σ = 2096946432. Its totient is φ = 522600840.

The previous prime is 1221310339. The next prime is 1221310361. The reversal of 1221310342 is 2430131221.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 58834 + ... + 76837.

It is an arithmetic number, because the mean of its divisors is an integer number (131059152).

Almost surely, 2^1221310342 is an apocalyptic number.

1221310342 is a deficient number, since it is larger than the sum of its proper divisors (875636090).

1221310342 is a wasteful number, since it uses less digits than its factorization.

1221310342 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 136323.

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

The square root of 1221310342 is about 34947.2508503888. The cubic root of 1221310342 is about 1068.9121450147.

Adding to 1221310342 its reverse (2430131221), we get a palindrome (3651441563).

The spelling of 1221310342 in words is "one billion, two hundred twenty-one million, three hundred ten thousand, three hundred forty-two".