21000000202 has 8 divisors (see below), whose sum is σ = 32586207300. Its totient is φ = 10137931104.

The previous prime is 21000000187. The next prime is 21000000209. The reversal of 21000000202 is 20200000012.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 20958642441 + 41357761 = 144771^2 + 6431^2 .

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 (21000000209) 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 3 ways as a sum of consecutive naturals, for example, 181034427 + ... + 181034542.

Almost surely, 2^21000000202 is an apocalyptic number.

21000000202 is a deficient number, since it is larger than the sum of its proper divisors (11586207098).

21000000202 is a wasteful number, since it uses less digits than its factorization.

21000000202 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 362069000.

The product of its (nonzero) digits is 8, while the sum is 7.

Adding to 21000000202 its reverse (20200000012), we get a palindrome (41200000214).

The spelling of 21000000202 in words is "twenty-one billion, two hundred two", and thus it is an aban number.