1213213122 has 48 divisors (see below), whose sum is σ = 2869989408. Its totient is φ = 367333440.

The previous prime is 1213213121. The next prime is 1213213129. The reversal of 1213213122 is 2213123121.

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

It is a nude number because it is divisible by every one of its digits.

It is a junction number, because it is equal to n+sod(n) for n = 1213213095 and 1213213104.

It is not an unprimeable number, because it can be changed into a prime (1213213121) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 377173 + ... + 380375.

It is an arithmetic number, because the mean of its divisors is an integer number (59791446).

Almost surely, 2^1213213122 is an apocalyptic number.

1213213122 is an abundant number, since it is smaller than the sum of its proper divisors (1656776286).

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

1213213122 is a wasteful number, since it uses less digits than its factorization.

1213213122 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5135 (or 5132 counting only the distinct ones).

The product of its digits is 144, while the sum is 18.

The square root of 1213213122 is about 34831.2090229438. The cubic root of 1213213122 is about 1066.5446289852.

Adding to 1213213122 its reverse (2213123121), we get a palindrome (3426336243).

Subtracting 1213213122 from its reverse (2213123121), we obtain a palindrome (999909999).

The spelling of 1213213122 in words is "one billion, two hundred thirteen million, two hundred thirteen thousand, one hundred twenty-two".