1221321846 has 16 divisors (see below), whose sum is σ = 2460474864. Its totient is φ = 404135424.

The previous prime is 1221321839. The next prime is 1221321851. The reversal of 1221321846 is 6481231221.

1221321846 is digitally balanced in base 4, because in such base it contains all the possibile digits an equal number of times.

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, 742075 + ... + 743718.

It is an arithmetic number, because the mean of its divisors is an integer number (153779679).

Almost surely, 2^1221321846 is an apocalyptic number.

1221321846 is an abundant number, since it is smaller than the sum of its proper divisors (1239153018).

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

1221321846 is a wasteful number, since it uses less digits than its factorization.

1221321846 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1485935.

The product of its digits is 4608, while the sum is 30.

The square root of 1221321846 is about 34947.4154409164. The cubic root of 1221321846 is about 1068.9155011714.

The spelling of 1221321846 in words is "one billion, two hundred twenty-one million, three hundred twenty-one thousand, eight hundred forty-six".