1221722886 has 32 divisors (see below), whose sum is σ = 2466846720. Its totient is φ = 403359264.

The previous prime is 1221722851. The next prime is 1221722893. The reversal of 1221722886 is 6882271221.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 291675 + ... + 295833.

It is an arithmetic number, because the mean of its divisors is an integer number (77088960).

Almost surely, 2^1221722886 is an apocalyptic number.

1221722886 is an abundant number, since it is smaller than the sum of its proper divisors (1245123834).

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

1221722886 is a wasteful number, since it uses less digits than its factorization.

1221722886 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4620.

The product of its digits is 43008, while the sum is 39.

The square root of 1221722886 is about 34953.1527333372. The cubic root of 1221722886 is about 1069.0324867041.

The spelling of 1221722886 in words is "one billion, two hundred twenty-one million, seven hundred twenty-two thousand, eight hundred eighty-six".