1221666052 has 24 divisors (see below), whose sum is σ = 2162184192. Its totient is φ = 603926400.

The previous prime is 1221666031. The next prime is 1221666079. The reversal of 1221666052 is 2506661221.

It is a hoax number, since the sum of its digits (31) coincides with the sum of the digits of its distinct prime factors.

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, 191677 + ... + 197947.

It is an arithmetic number, because the mean of its divisors is an integer number (90091008).

Almost surely, 2^1221666052 is an apocalyptic number.

It is an amenable number.

1221666052 is a deficient number, since it is larger than the sum of its proper divisors (940518140).

1221666052 is a wasteful number, since it uses less digits than its factorization.

1221666052 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6819 (or 6817 counting only the distinct ones).

The product of its (nonzero) digits is 8640, while the sum is 31.

The square root of 1221666052 is about 34952.3397213978. The cubic root of 1221666052 is about 1069.0159094766.

The spelling of 1221666052 in words is "one billion, two hundred twenty-one million, six hundred sixty-six thousand, fifty-two".