221152424 has 8 divisors (see below), whose sum is σ = 414660810. Its totient is φ = 110576208.

The previous prime is 221152409. The next prime is 221152427. The reversal of 221152424 is 424251122.

It can be written as a sum of positive squares in only one way, i.e., 148596100 + 72556324 = 12190^2 + 8518^2 .

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

It is a self number, because there is not a number n which added to its sum of digits gives 221152424.

It is not an unprimeable number, because it can be changed into a prime (221152427) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13822019 + ... + 13822034.

Almost surely, 2^221152424 is an apocalyptic number.

It is an amenable number.

221152424 is a deficient number, since it is larger than the sum of its proper divisors (193508386).

221152424 is a wasteful number, since it uses less digits than its factorization.

221152424 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27644059 (or 27644055 counting only the distinct ones).

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

The square root of 221152424 is about 14871.1944375696. The cubic root of 221152424 is about 604.7333241750.

The spelling of 221152424 in words is "two hundred twenty-one million, one hundred fifty-two thousand, four hundred twenty-four".