1222221240 has 96 divisors (see below), whose sum is σ = 4109227200. Its totient is φ = 314684160.

The previous prime is 1222221233. The next prime is 1222221257. The reversal of 1222221240 is 421222221.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 48096 + ... + 68975.

It is an arithmetic number, because the mean of its divisors is an integer number (42804450).

Almost surely, 2^1222221240 is an apocalyptic number.

1222221240 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1222221240 is an abundant number, since it is smaller than the sum of its proper divisors (2887005960).

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

1222221240 is a wasteful number, since it uses less digits than its factorization.

1222221240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 117117 (or 117110 counting only the distinct ones).

The product of its (nonzero) digits is 256, while the sum is 18.

The square root of 1222221240 is about 34960.2808913201. The cubic root of 1222221240 is about 1069.1778235884.

Adding to 1222221240 its reverse (421222221), we get a palindrome (1643443461).

The spelling of 1222221240 in words is "one billion, two hundred twenty-two million, two hundred twenty-one thousand, two hundred forty".