221101002 has 20 divisors (see below), whose sum is σ = 495430386. Its totient is φ = 73700280.

The previous prime is 221100989. The next prime is 221101007. The reversal of 221101002 is 200101122.

It can be written as a sum of positive squares in only one way, i.e., 135001161 + 86099841 = 11619^2 + 9279^2 .

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 (221101007) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 682249 + ... + 682572.

Almost surely, 2^221101002 is an apocalyptic number.

221101002 is an abundant number, since it is smaller than the sum of its proper divisors (274329384).

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

221101002 is a wasteful number, since it uses less digits than its factorization.

221101002 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1364835 (or 1364826 counting only the distinct ones).

The product of its (nonzero) digits is 8, while the sum is 9.

The square root of 221101002 is about 14869.4654241503. The cubic root of 221101002 is about 604.6864500072.

Adding to 221101002 its reverse (200101122), we get a palindrome (421202124).

The spelling of 221101002 in words is "two hundred twenty-one million, one hundred one thousand, two".