221440986 has 64 divisors (see below), whose sum is σ = 532103040. Its totient is φ = 67858560.

The previous prime is 221440981. The next prime is 221441053. The reversal of 221440986 is 689044122.

It is a super-2 number, since 2×221440986² = 98072220561304392, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 221440986.

It is not an unprimeable number, because it can be changed into a prime (221440981) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 231886 + ... + 232838.

It is an arithmetic number, because the mean of its divisors is an integer number (8314110).

Almost surely, 2^221440986 is an apocalyptic number.

221440986 is a gapful number since it is divisible by the number (26) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 221440986, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (266051520).

221440986 is an abundant number, since it is smaller than the sum of its proper divisors (310662054).

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

221440986 is a wasteful number, since it uses less digits than its factorization.

221440986 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1308 (or 1302 counting only the distinct ones).

The product of its (nonzero) digits is 27648, while the sum is 36.

The square root of 221440986 is about 14880.8933199590. The cubic root of 221440986 is about 604.9962306529.

The spelling of 221440986 in words is "two hundred twenty-one million, four hundred forty thousand, nine hundred eighty-six".