1221886560 has 192 divisors, whose sum is σ = 4108853952. Its totient is φ = 304152576.

The previous prime is 1221886559. The next prime is 1221886573. The reversal of 1221886560 is 656881221.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1117374 + ... + 1118466.

It is an arithmetic number, because the mean of its divisors is an integer number (21400281).

Almost surely, 2^1221886560 is an apocalyptic number.

1221886560 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1221886560, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2054426976).

1221886560 is an abundant number, since it is smaller than the sum of its proper divisors (2886967392).

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

1221886560 is a wasteful number, since it uses less digits than its factorization.

1221886560 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1265 (or 1257 counting only the distinct ones).

The product of its (nonzero) digits is 46080, while the sum is 39.

The square root of 1221886560 is about 34955.4939887852. The cubic root of 1221886560 is about 1069.0802239371.

The spelling of 1221886560 in words is "one billion, two hundred twenty-one million, eight hundred eighty-six thousand, five hundred sixty".