221469456 has 120 divisors (see below), whose sum is σ = 642014464. Its totient is φ = 65329920.

The previous prime is 221469449. The next prime is 221469497. The reversal of 221469456 is 654964122.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (39).

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 23 ways as a sum of consecutive naturals, for example, 2069755 + ... + 2069861.

Almost surely, 2^221469456 is an apocalyptic number.

221469456 is a gapful number since it is divisible by the number (26) 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 221469456, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (321007232).

221469456 is an abundant number, since it is smaller than the sum of its proper divisors (420545008).

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

221469456 is a wasteful number, since it uses less digits than its factorization.

221469456 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 269 (or 156 counting only the distinct ones).

The product of its digits is 103680, while the sum is 39.

The square root of 221469456 is about 14881.8498850109. The cubic root of 221469456 is about 605.0221570557.

The spelling of 221469456 in words is "two hundred twenty-one million, four hundred sixty-nine thousand, four hundred fifty-six".