1221121012 has 12 divisors (see below), whose sum is σ = 2164012480. Its totient is φ = 602831736.

The previous prime is 1221121003. The next prime is 1221121021. The reversal of 1221121012 is 2101211221.

It is an interprime number because it is at equal distance from previous prime (1221121003) and next prime (1221121021).

It is a super-2 number, since 2×1221121012² = 2982273051895808288, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 1221120983 and 1221121001.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1931838 + ... + 1932469.

Almost surely, 2^1221121012 is an apocalyptic number.

It is an amenable number.

1221121012 is a deficient number, since it is larger than the sum of its proper divisors (942891468).

1221121012 is a wasteful number, since it uses less digits than its factorization.

1221121012 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3864390 (or 3864388 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 13.

The square root of 1221121012 is about 34944.5419486363. The cubic root of 1221121012 is about 1068.8569071859.

Adding to 1221121012 its reverse (2101211221), we get a palindrome (3322332233).

The spelling of 1221121012 in words is "one billion, two hundred twenty-one million, one hundred twenty-one thousand, twelve".