221540002 has 8 divisors (see below), whose sum is σ = 346758336. Its totient is φ = 105953892.

The previous prime is 221539963. The next prime is 221540009. The reversal of 221540002 is 200045122.

221540002 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not an unprimeable number, because it can be changed into a prime (221540009) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2407998 + ... + 2408089.

It is an arithmetic number, because the mean of its divisors is an integer number (43344792).

Almost surely, 2^221540002 is an apocalyptic number.

221540002 is a deficient number, since it is larger than the sum of its proper divisors (125218334).

221540002 is a wasteful number, since it uses less digits than its factorization.

221540002 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4816112.

The product of its (nonzero) digits is 160, while the sum is 16.

The square root of 221540002 is about 14884.2198989400. The cubic root of 221540002 is about 605.0863906868.

Adding to 221540002 its reverse (200045122), we get a palindrome (421585124).

The spelling of 221540002 in words is "two hundred twenty-one million, five hundred forty thousand, two".