221023312002 has 12 divisors (see below), whose sum is σ = 478883842710. Its totient is φ = 73674437328.

The previous prime is 221023311917. The next prime is 221023312007. The reversal of 221023312002 is 200213320122.

It can be written as a sum of positive squares in only one way, i.e., 150505978401 + 70517333601 = 387951^2 + 265551^2 .

It is a Harshad number since it is a multiple of its sum of digits (18), and also a Moran number because the ratio is a prime number: 12279072889 = 221023312002 / (2 + 2 + 1 + 0 + 2 + 3 + 3 + 1 + 2 + 0 + 0 + 2).

It is not an unprimeable number, because it can be changed into a prime (221023312007) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 6139536427 + ... + 6139536462.

Almost surely, 2^221023312002 is an apocalyptic number.

221023312002 is an abundant number, since it is smaller than the sum of its proper divisors (257860530708).

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

221023312002 is a wasteful number, since it uses less digits than its factorization.

221023312002 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12279072897 (or 12279072894 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 18.

Adding to 221023312002 its reverse (200213320122), we get a palindrome (421236632124).

The spelling of 221023312002 in words is "two hundred twenty-one billion, twenty-three million, three hundred twelve thousand, two".