220021002 has 16 divisors (see below), whose sum is σ = 488935680. Its totient is φ = 73340316.

The previous prime is 220020949. The next prime is 220021003. The reversal of 220021002 is 200120022.

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 (220021003) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2037178 + ... + 2037285.

It is an arithmetic number, because the mean of its divisors is an integer number (30558480).

Almost surely, 2^220021002 is an apocalyptic number.

220021002 is an abundant number, since it is smaller than the sum of its proper divisors (268914678).

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

220021002 is a wasteful number, since it uses less digits than its factorization.

220021002 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4074474 (or 4074468 counting only the distinct ones).

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

The square root of 220021002 is about 14833.1049345712. The cubic root of 220021002 is about 603.7002829320.

Adding to 220021002 its reverse (200120022), we get a palindrome (420141024).

The spelling of 220021002 in words is "two hundred twenty million, twenty-one thousand, two".