1221065342 has 32 divisors (see below), whose sum is σ = 2158244352. Its totient is φ = 507177504.

The previous prime is 1221065333. The next prime is 1221065383. The reversal of 1221065342 is 2435601221.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 131753 + ... + 140715.

It is an arithmetic number, because the mean of its divisors is an integer number (67445136).

Almost surely, 2^1221065342 is an apocalyptic number.

1221065342 is a deficient number, since it is larger than the sum of its proper divisors (937179010).

1221065342 is a wasteful number, since it uses less digits than its factorization.

1221065342 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9272.

The product of its (nonzero) digits is 2880, while the sum is 26.

The square root of 1221065342 is about 34943.7453917006. The cubic root of 1221065342 is about 1068.8406641415.

Adding to 1221065342 its reverse (2435601221), we get a palindrome (3656666563).

The spelling of 1221065342 in words is "one billion, two hundred twenty-one million, sixty-five thousand, three hundred forty-two".