1221120612 has 36 divisors (see below), whose sum is σ = 3092414416. Its totient is φ = 406289520.

The previous prime is 1221120599. The next prime is 1221120643. The reversal of 1221120612 is 2160211221.

1221120612 is a `hidden beast` number, since 1 + 22 + 11 + 20 + 612 = 666.

It is a tau number, because it is divible by the number of its divisors (36).

It is a super-2 number, since 2×1221120612² = 2982271098102509088, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 11314 + ... + 50697.

Almost surely, 2^1221120612 is an apocalyptic number.

1221120612 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

1221120612 is an abundant number, since it is smaller than the sum of its proper divisors (1871293804).

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

1221120612 is a wasteful number, since it uses less digits than its factorization.

1221120612 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 62568 (or 62563 counting only the distinct ones).

The product of its (nonzero) digits is 96, while the sum is 18.

The square root of 1221120612 is about 34944.5362252813. The cubic root of 1221120612 is about 1068.8567904781.

Adding to 1221120612 its reverse (2160211221), we get a palindrome (3381331833).

It can be divided in two parts, 12211 and 20612, that added together give a palindrome (32823).

The spelling of 1221120612 in words is "one billion, two hundred twenty-one million, one hundred twenty thousand, six hundred twelve".