1221880670 has 16 divisors (see below), whose sum is σ = 2200791168. Its totient is φ = 488439840.

The previous prime is 1221880663. The next prime is 1221880697. The reversal of 1221880670 is 760881221.

It is a self number, because there is not a number n which added to its sum of digits gives 1221880670.

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, 22286 + ... + 54225.

It is an arithmetic number, because the mean of its divisors is an integer number (137549448).

Almost surely, 2^1221880670 is an apocalyptic number.

1221880670 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1221880670 is a deficient number, since it is larger than the sum of its proper divisors (978910498).

1221880670 is a wasteful number, since it uses less digits than its factorization.

1221880670 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 78115.

The product of its (nonzero) digits is 10752, while the sum is 35.

The square root of 1221880670 is about 34955.4097386942. The cubic root of 1221880670 is about 1069.0785061309.

The spelling of 1221880670 in words is "one billion, two hundred twenty-one million, eight hundred eighty thousand, six hundred seventy".