1221880086 has 64 divisors (see below), whose sum is σ = 3106805760. Its totient is φ = 348701760.

The previous prime is 1221880067. The next prime is 1221880133. The reversal of 1221880086 is 6800881221.

It is a hoax number, since the sum of its digits (36) coincides with the sum of the digits of its distinct prime factors.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 1221880086.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 498115 + ... + 500561.

It is an arithmetic number, because the mean of its divisors is an integer number (48543840).

Almost surely, 2^1221880086 is an apocalyptic number.

1221880086 is an abundant number, since it is smaller than the sum of its proper divisors (1884925674).

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

1221880086 is a wasteful number, since it uses less digits than its factorization.

1221880086 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3786 (or 3780 counting only the distinct ones).

The product of its (nonzero) digits is 12288, while the sum is 36.

The square root of 1221880086 is about 34955.4013851937. The cubic root of 1221880086 is about 1069.0783358083.

The spelling of 1221880086 in words is "one billion, two hundred twenty-one million, eight hundred eighty thousand, eighty-six".