1212213132 has 72 divisors (see below), whose sum is σ = 3305265600. Its totient is φ = 372384000.

The previous prime is 1212213097. The next prime is 1212213133. The reversal of 1212213132 is 2313122121.

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 not an unprimeable number, because it can be changed into a prime (1212213133) 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, 349744 + ... + 353192.

Almost surely, 2^1212213132 is an apocalyptic number.

1212213132 is a gapful number since it is divisible by the number (12) 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 1212213132, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1652632800).

1212213132 is an abundant number, since it is smaller than the sum of its proper divisors (2093052468).

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

1212213132 is a wasteful number, since it uses less digits than its factorization.

1212213132 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4223 (or 4218 counting only the distinct ones).

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

The square root of 1212213132 is about 34816.8512648689. The cubic root of 1212213132 is about 1066.2515155692.

Adding to 1212213132 its reverse (2313122121), we get a palindrome (3525335253).

The spelling of 1212213132 in words is "one billion, two hundred twelve million, two hundred thirteen thousand, one hundred thirty-two".