1213222140 has 72 divisors (see below), whose sum is σ = 3963199968. Its totient is φ = 298638720.

The previous prime is 1213222123. The next prime is 1213222141. The reversal of 1213222140 is 412223121.

It is a happy number.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1213222141) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 256896 + ... + 261575.

It is an arithmetic number, because the mean of its divisors is an integer number (55044444).

Almost surely, 2^1213222140 is an apocalyptic number.

1213222140 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1213222140 is an abundant number, since it is smaller than the sum of its proper divisors (2749977828).

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

1213222140 is a wasteful number, since it uses less digits than its factorization.

1213222140 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 518499 (or 518494 counting only the distinct ones).

The product of its (nonzero) digits is 192, while the sum is 18.

The square root of 1213222140 is about 34831.3384755740. The cubic root of 1213222140 is about 1066.5472715755.

Adding to 1213222140 its reverse (412223121), we get a palindrome (1625445261).

The spelling of 1213222140 in words is "one billion, two hundred thirteen million, two hundred twenty-two thousand, one hundred forty".