1221242340 has 48 divisors (see below), whose sum is σ = 3421414080. Its totient is φ = 325480320.

The previous prime is 1221242333. The next prime is 1221242369. The reversal of 1221242340 is 432421221.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 126070 + ... + 135410.

It is an arithmetic number, because the mean of its divisors is an integer number (71279460).

Almost surely, 2^1221242340 is an apocalyptic number.

1221242340 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1221242340 is an abundant number, since it is smaller than the sum of its proper divisors (2200171740).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1221242340 is a wasteful number, since it uses less digits than its factorization.

1221242340 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11532 (or 11530 counting only the distinct ones).

The product of its (nonzero) digits is 768, while the sum is 21.

The square root of 1221242340 is about 34946.2779133916. The cubic root of 1221242340 is about 1068.8923058004.

Adding to 1221242340 its reverse (432421221), we get a palindrome (1653663561).

The spelling of 1221242340 in words is "one billion, two hundred twenty-one million, two hundred forty-two thousand, three hundred forty".