1213233220 has 96 divisors (see below), whose sum is σ = 2867356800. Its totient is φ = 428488704.

The previous prime is 1213233211. The next prime is 1213233227. The reversal of 1213233220 is 223323121.

It is a super-2 number, since 2×1213233220² = 2943869692223136800, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (19).

It is not an unprimeable number, because it can be changed into a prime (1213233227) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 703279 + ... + 705001.

It is an arithmetic number, because the mean of its divisors is an integer number (29868300).

Almost surely, 2^1213233220 is an apocalyptic number.

1213233220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1213233220, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1433678400).

1213233220 is an abundant number, since it is smaller than the sum of its proper divisors (1654123580).

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

1213233220 is a wasteful number, since it uses less digits than its factorization.

1213233220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1877 (or 1875 counting only the distinct ones).

The product of its (nonzero) digits is 432, while the sum is 19.

The square root of 1213233220 is about 34831.4975273817. The cubic root of 1213233220 is about 1066.5505183862.

Adding to 1213233220 its reverse (223323121), we get a palindrome (1436556341).

The spelling of 1213233220 in words is "one billion, two hundred thirteen million, two hundred thirty-three thousand, two hundred twenty".