221520148 has 12 divisors (see below), whose sum is σ = 388925152. Its totient is φ = 110398680.

The previous prime is 221520137. The next prime is 221520151. The reversal of 221520148 is 841025122.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 88968 + ... + 91423.

Almost surely, 2^221520148 is an apocalyptic number.

It is an amenable number.

221520148 is a deficient number, since it is larger than the sum of its proper divisors (167405004).

221520148 is a wasteful number, since it uses less digits than its factorization.

221520148 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 180702 (or 180700 counting only the distinct ones).

The product of its (nonzero) digits is 1280, while the sum is 25.

The square root of 221520148 is about 14883.5529360432. The cubic root of 221520148 is about 605.0683145771.

The spelling of 221520148 in words is "two hundred twenty-one million, five hundred twenty thousand, one hundred forty-eight".