21202120202 has 16 divisors (see below), whose sum is σ = 31964596800. Its totient is φ = 10547288640.

The previous prime is 21202120193. The next prime is 21202120211. The reversal of 21202120202 is 20202120212.

It is an interprime number because it is at equal distance from previous prime (21202120193) and next prime (21202120211).

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1634699 + ... + 1647617.

It is an arithmetic number, because the mean of its divisors is an integer number (1997787300).

Almost surely, 2^21202120202 is an apocalyptic number.

21202120202 is a deficient number, since it is larger than the sum of its proper divisors (10762476598).

21202120202 is a wasteful number, since it uses less digits than its factorization.

21202120202 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17021.

The product of its (nonzero) digits is 64, while the sum is 14.

Adding to 21202120202 its reverse (20202120212), we get a palindrome (41404240414).

The spelling of 21202120202 in words is "twenty-one billion, two hundred two million, one hundred twenty thousand, two hundred two".