21021544202 has 8 divisors (see below), whose sum is σ = 31733159556. Its totient is φ = 10443824352.

The previous prime is 21021544183. The next prime is 21021544213. The reversal of 21021544202 is 20244512012.

It can be written as a sum of positive squares in 2 ways, for example, as 17590982161 + 3430562041 = 132631^2 + 58571^2 .

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

It is an unprimeable number.

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, 33473483 + ... + 33474110.

Almost surely, 2^21021544202 is an apocalyptic number.

21021544202 is a deficient number, since it is larger than the sum of its proper divisors (10711615354).

21021544202 is a wasteful number, since it uses less digits than its factorization.

21021544202 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 66947752.

The product of its (nonzero) digits is 1280, while the sum is 23.

The spelling of 21021544202 in words is "twenty-one billion, twenty-one million, five hundred forty-four thousand, two hundred two".