221424152 has 8 divisors (see below), whose sum is σ = 415170300. Its totient is φ = 110712072.

The previous prime is 221424139. The next prime is 221424223. The reversal of 221424152 is 251424122.

It is a tau number, because it is divible by the number of its divisors (8).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13839002 + ... + 13839017.

Almost surely, 2^221424152 is an apocalyptic number.

It is an amenable number.

221424152 is a deficient number, since it is larger than the sum of its proper divisors (193746148).

221424152 is a wasteful number, since it uses less digits than its factorization.

221424152 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27678025 (or 27678021 counting only the distinct ones).

The product of its digits is 1280, while the sum is 23.

The square root of 221424152 is about 14880.3276845639. The cubic root of 221424152 is about 604.9808996087.

Adding to 221424152 its reverse (251424122), we get a palindrome (472848274).

The spelling of 221424152 in words is "two hundred twenty-one million, four hundred twenty-four thousand, one hundred fifty-two".