221001324 has 12 divisors (see below), whose sum is σ = 515669784. Its totient is φ = 73667104.

The previous prime is 221001311. The next prime is 221001337. The reversal of 221001324 is 423100122.

221001324 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (221001311) and next prime (221001337).

It is a tau number, because it is divible by the number of its divisors (12).

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, 9208377 + ... + 9208400.

It is an arithmetic number, because the mean of its divisors is an integer number (42972482).

Almost surely, 2^221001324 is an apocalyptic number.

It is an amenable number.

221001324 is an abundant number, since it is smaller than the sum of its proper divisors (294668460).

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

221001324 is a wasteful number, since it uses less digits than its factorization.

221001324 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18416784 (or 18416782 counting only the distinct ones).

The product of its (nonzero) digits is 96, while the sum is 15.

The square root of 221001324 is about 14866.1132781908. The cubic root of 221001324 is about 604.5955669637.

Adding to 221001324 its reverse (423100122), we get a palindrome (644101446).

The spelling of 221001324 in words is "two hundred twenty-one million, one thousand, three hundred twenty-four".