1213032220 has 48 divisors (see below), whose sum is σ = 2580133248. Its totient is φ = 479001600.

The previous prime is 1213032217. The next prime is 1213032269. The reversal of 1213032220 is 222303121.

It is a junction number, because it is equal to n+sod(n) for n = 1213032194 and 1213032203.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 934612 + ... + 935908.

It is an arithmetic number, because the mean of its divisors is an integer number (53752776).

Almost surely, 2^1213032220 is an apocalyptic number.

1213032220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1213032220 is an abundant number, since it is smaller than the sum of its proper divisors (1367101028).

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

1213032220 is a wasteful number, since it uses less digits than its factorization.

1213032220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1870 (or 1868 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 16.

The square root of 1213032220 is about 34828.6120883391. The cubic root of 1213032220 is about 1066.4916155881.

Adding to 1213032220 its reverse (222303121), we get a palindrome (1435335341).

The spelling of 1213032220 in words is "one billion, two hundred thirteen million, thirty-two thousand, two hundred twenty".