1221132252 has 12 divisors (see below), whose sum is σ = 2849308616. Its totient is φ = 407044080.

The previous prime is 1221132251. The next prime is 1221132281. The reversal of 1221132252 is 2522311221.

It is a tau number, because it is divible by the number of its divisors (12).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1221132251) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 50880499 + ... + 50880522.

Almost surely, 2^1221132252 is an apocalyptic number.

1221132252 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

1221132252 is an abundant number, since it is smaller than the sum of its proper divisors (1628176364).

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

1221132252 is a wasteful number, since it uses less digits than its factorization.

1221132252 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 101761028 (or 101761026 counting only the distinct ones).

The product of its digits is 480, while the sum is 21.

The square root of 1221132252 is about 34944.7027745265. The cubic root of 1221132252 is about 1068.8601866628.

Adding to 1221132252 its reverse (2522311221), we get a palindrome (3743443473).

The spelling of 1221132252 in words is "one billion, two hundred twenty-one million, one hundred thirty-two thousand, two hundred fifty-two".