1221100132 has 24 divisors (see below), whose sum is σ = 2570738240. Its totient is φ = 495784800.

The previous prime is 1221100121. The next prime is 1221100141. The reversal of 1221100132 is 2310011221.

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, 1147119 + ... + 1148182.

Almost surely, 2^1221100132 is an apocalyptic number.

It is an amenable number.

1221100132 is an abundant number, since it is smaller than the sum of its proper divisors (1349638108).

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

1221100132 is a wasteful number, since it uses less digits than its factorization.

1221100132 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2295331 (or 2295329 counting only the distinct ones).

The product of its (nonzero) digits is 24, while the sum is 13.

The square root of 1221100132 is about 34944.2431882563. The cubic root of 1221100132 is about 1068.8508150079.

Adding to 1221100132 its reverse (2310011221), we get a palindrome (3531111353).

The spelling of 1221100132 in words is "one billion, two hundred twenty-one million, one hundred thousand, one hundred thirty-two".