21173205202 has 16 divisors (see below), whose sum is σ = 32299771392. Its totient is φ = 10408060800.

The previous prime is 21173205139. The next prime is 21173205241. The reversal of 21173205202 is 20250237112.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 332098 + ... + 390685.

It is an arithmetic number, because the mean of its divisors is an integer number (2018735712).

Almost surely, 2^21173205202 is an apocalyptic number.

21173205202 is a deficient number, since it is larger than the sum of its proper divisors (11126566190).

21173205202 is a wasteful number, since it uses less digits than its factorization.

21173205202 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 723033.

The product of its (nonzero) digits is 1680, while the sum is 25.

The spelling of 21173205202 in words is "twenty-one billion, one hundred seventy-three million, two hundred five thousand, two hundred two".