221002002 has 24 divisors (see below), whose sum is σ = 515671884. Its totient is φ = 68000544.

The previous prime is 221001967. The next prime is 221002003. The reversal of 221002002 is 200200122.

It can be written as a sum of positive squares in 2 ways, for example, as 181198521 + 39803481 = 13461^2 + 6309^2 .

It is a Harshad number since it is a multiple of its sum of digits (9).

It is not an unprimeable number, because it can be changed into a prime (221002003) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 471993 + ... + 472460.

Almost surely, 2^221002002 is an apocalyptic number.

221002002 is an abundant number, since it is smaller than the sum of its proper divisors (294669882).

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

221002002 is a wasteful number, since it uses less digits than its factorization.

221002002 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 944474 (or 944471 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 9.

The square root of 221002002 is about 14866.1360817127. The cubic root of 221002002 is about 604.5961852336.

Adding to 221002002 its reverse (200200122), we get a palindrome (421202124).

The spelling of 221002002 in words is "two hundred twenty-one million, two thousand, two".