221001002018 has 4 divisors (see below), whose sum is σ = 331501503030. Its totient is φ = 110500501008.

The previous prime is 221001002009. The next prime is 221001002059. The reversal of 221001002018 is 810200100122.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 217992808609 + 3008193409 = 466897^2 + 54847^2 .

It is a junction number, because it is equal to n+sod(n) for n = 221001001987 and 221001002005.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 55250250503 + ... + 55250250506.

Almost surely, 2^221001002018 is an apocalyptic number.

221001002018 is a deficient number, since it is larger than the sum of its proper divisors (110500501012).

221001002018 is a wasteful number, since it uses less digits than its factorization.

221001002018 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 110500501011.

The product of its (nonzero) digits is 64, while the sum is 17.

The spelling of 221001002018 in words is "two hundred twenty-one billion, one million, two thousand, eighteen".