221495000 has 80 divisors (see below), whose sum is σ = 536078400. Its totient is φ = 85680000.

The previous prime is 221494993. The next prime is 221495009. The reversal of 221495000 is 594122.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221495009) 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 19 ways as a sum of consecutive naturals, for example, 154286 + ... + 155714.

It is an arithmetic number, because the mean of its divisors is an integer number (6700980).

Almost surely, 2^221495000 is an apocalyptic number.

221495000 is a gapful number since it is divisible by the number (20) 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 221495000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (268039200).

221495000 is an abundant number, since it is smaller than the sum of its proper divisors (314583400).

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

221495000 is a wasteful number, since it uses less digits than its factorization.

221495000 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1486 (or 1467 counting only the distinct ones).

The product of its (nonzero) digits is 720, while the sum is 23.

The square root of 221495000 is about 14882.7080869041. The cubic root of 221495000 is about 605.0454169853.

The spelling of 221495000 in words is "two hundred twenty-one million, four hundred ninety-five thousand".