221497136 has 40 divisors (see below), whose sum is σ = 516276480. Its totient is φ = 89930304.

The previous prime is 221497103. The next prime is 221497187. The reversal of 221497136 is 631794122.

221497136 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a junction number, because it is equal to n+sod(n) for n = 221497096 and 221497105.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 49916 + ... + 54171.

It is an arithmetic number, because the mean of its divisors is an integer number (12906912).

Almost surely, 2^221497136 is an apocalyptic number.

It is an amenable number.

221497136 is an abundant number, since it is smaller than the sum of its proper divisors (294779344).

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

221497136 is a wasteful number, since it uses less digits than its factorization.

221497136 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 104121 (or 104115 counting only the distinct ones).

The product of its digits is 18144, while the sum is 35.

The square root of 221497136 is about 14882.7798478644. The cubic root of 221497136 is about 605.0473619093.

The spelling of 221497136 in words is "two hundred twenty-one million, four hundred ninety-seven thousand, one hundred thirty-six".