1221069612 has 36 divisors (see below), whose sum is σ = 3314333400. Its totient is φ = 348876864.

The previous prime is 1221069607. The next prime is 1221069617. The reversal of 1221069612 is 2169601221.

It is an interprime number because it is at equal distance from previous prime (1221069607) and next prime (1221069617).

It is a self number, because there is not a number n which added to its sum of digits gives 1221069612.

It is not an unprimeable number, because it can be changed into a prime (1221069617) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1037737 + ... + 1038912.

Almost surely, 2^1221069612 is an apocalyptic number.

1221069612 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

1221069612 is an abundant number, since it is smaller than the sum of its proper divisors (2093263788).

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

1221069612 is a wasteful number, since it uses less digits than its factorization.

1221069612 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2076670 (or 2076661 counting only the distinct ones).

The product of its (nonzero) digits is 2592, while the sum is 30.

The square root of 1221069612 is about 34943.8064898488. The cubic root of 1221069612 is about 1068.8419100329.

The spelling of 1221069612 in words is "one billion, two hundred twenty-one million, sixty-nine thousand, six hundred twelve".