1221152668 has 24 divisors (see below), whose sum is σ = 2148128640. Its totient is φ = 607411200.

The previous prime is 1221152633. The next prime is 1221152729. The reversal of 1221152668 is 8662511221.

It is a happy number.

It is a congruent number.

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, 847893 + ... + 849331.

It is an arithmetic number, because the mean of its divisors is an integer number (89505360).

Almost surely, 2^1221152668 is an apocalyptic number.

It is an amenable number.

1221152668 is a deficient number, since it is larger than the sum of its proper divisors (926975972).

1221152668 is a wasteful number, since it uses less digits than its factorization.

1221152668 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2397 (or 2395 counting only the distinct ones).

The product of its digits is 11520, while the sum is 34.

The square root of 1221152668 is about 34944.9948919727. The cubic root of 1221152668 is about 1068.8661433553.

Adding to 1221152668 its reverse (8662511221), we get a palindrome (9883663889).

The spelling of 1221152668 in words is "one billion, two hundred twenty-one million, one hundred fifty-two thousand, six hundred sixty-eight".