21020002202 has 8 divisors (see below), whose sum is σ = 31542517812. Its totient is φ = 10505829600.

The previous prime is 21020002193. The next prime is 21020002207. The reversal of 21020002202 is 20220002012.

It can be written as a sum of positive squares in 2 ways, for example, as 20468738761 + 551263441 = 143069^2 + 23479^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not an unprimeable number, because it can be changed into a prime (21020002207) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2079449 + ... + 2089532.

Almost surely, 2^21020002202 is an apocalyptic number.

21020002202 is a deficient number, since it is larger than the sum of its proper divisors (10522515610).

21020002202 is a wasteful number, since it uses less digits than its factorization.

21020002202 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4171504.

The product of its (nonzero) digits is 32, while the sum is 11.

Adding to 21020002202 its reverse (20220002012), we get a palindrome (41240004214).

The spelling of 21020002202 in words is "twenty-one billion, twenty million, two thousand, two hundred two".