221275236 has 96 divisors (see below), whose sum is σ = 642315520. Its totient is φ = 57729024.

The previous prime is 221275199. The next prime is 221275279. The reversal of 221275236 is 632572122.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 104880 + ... + 106968.

Almost surely, 2^221275236 is an apocalyptic number.

221275236 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 221275236, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (321157760).

221275236 is an abundant number, since it is smaller than the sum of its proper divisors (421040284).

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

221275236 is a wasteful number, since it uses less digits than its factorization.

221275236 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2213 (or 2211 counting only the distinct ones).

The product of its digits is 10080, while the sum is 30.

The square root of 221275236 is about 14875.3230553155. The cubic root of 221275236 is about 604.8452451209.

The spelling of 221275236 in words is "two hundred twenty-one million, two hundred seventy-five thousand, two hundred thirty-six".