1222221040 has 20 divisors (see below), whose sum is σ = 2841664104. Its totient is φ = 488888384.

The previous prime is 1222221031. The next prime is 1222221047. The reversal of 1222221040 is 401222221.

It is a tau number, because it is divible by the number of its divisors (20).

It is a Harshad number since it is a multiple of its sum of digits (16).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1222221047) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7638802 + ... + 7638961.

Almost surely, 2^1222221040 is an apocalyptic number.

1222221040 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1222221040 is an abundant number, since it is smaller than the sum of its proper divisors (1619443064).

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

1222221040 is a wasteful number, since it uses less digits than its factorization.

1222221040 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15277776 (or 15277770 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 16.

The square root of 1222221040 is about 34960.2780309310. The cubic root of 1222221040 is about 1069.1777652696.

Adding to 1222221040 its reverse (401222221), we get a palindrome (1623443261).

The spelling of 1222221040 in words is "one billion, two hundred twenty-two million, two hundred twenty-one thousand, forty".