1221212132 has 24 divisors (see below), whose sum is σ = 2455090176. Its totient is φ = 520662528.

The previous prime is 1221212089. The next prime is 1221212143. The reversal of 1221212132 is 2312121221.

It is a self number, because there is not a number n which added to its sum of digits gives 1221212132.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 107588 + ... + 118395.

It is an arithmetic number, because the mean of its divisors is an integer number (102295424).

Almost surely, 2^1221212132 is an apocalyptic number.

It is an amenable number.

1221212132 is an abundant number, since it is smaller than the sum of its proper divisors (1233878044).

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

1221212132 is a wasteful number, since it uses less digits than its factorization.

1221212132 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 226187 (or 226185 counting only the distinct ones).

The product of its digits is 96, while the sum is 17.

The square root of 1221212132 is about 34945.8457044611. The cubic root of 1221212132 is about 1068.8834925442.

Adding to 1221212132 its reverse (2312121221), we get a palindrome (3533333353).

The spelling of 1221212132 in words is "one billion, two hundred twenty-one million, two hundred twelve thousand, one hundred thirty-two".