1212221120 has 112 divisors (see below), whose sum is σ = 3159837216. Its totient is φ = 439296000.

The previous prime is 1212221119. The next prime is 1212221149. The reversal of 1212221120 is 211222121.

It is a junction number, because it is equal to n+sod(n) for n = 1212221095 and 1212221104.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1833590 + ... + 1834250.

Almost surely, 2^1212221120 is an apocalyptic number.

1212221120 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 1212221120, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1579918608).

1212221120 is an abundant number, since it is smaller than the sum of its proper divisors (1947616096).

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

1212221120 is a wasteful number, since it uses less digits than its factorization.

1212221120 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1210 (or 1200 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 14.

The square root of 1212221120 is about 34816.9659792464. The cubic root of 1212221120 is about 1066.2538576211.

Adding to 1212221120 its reverse (211222121), we get a palindrome (1423443241).

The spelling of 1212221120 in words is "one billion, two hundred twelve million, two hundred twenty-one thousand, one hundred twenty".