1221422440 has 32 divisors (see below), whose sum is σ = 3140801280. Its totient is φ = 418773312.

The previous prime is 1221422393. The next prime is 1221422483. The reversal of 1221422440 is 442241221.

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, 2180832 + ... + 2181391.

It is an arithmetic number, because the mean of its divisors is an integer number (98150040).

Almost surely, 2^1221422440 is an apocalyptic number.

1221422440 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1221422440 is an abundant number, since it is smaller than the sum of its proper divisors (1919378840).

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

1221422440 is a wasteful number, since it uses less digits than its factorization.

1221422440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4362241 (or 4362237 counting only the distinct ones).

The product of its (nonzero) digits is 1024, while the sum is 22.

The square root of 1221422440 is about 34948.8546307315. The cubic root of 1221422440 is about 1068.9448473901.

Adding to 1221422440 its reverse (442241221), we get a palindrome (1663663661).

The spelling of 1221422440 in words is "one billion, two hundred twenty-one million, four hundred twenty-two thousand, four hundred forty".