21112320202 has 16 divisors (see below), whose sum is σ = 31816620360. Its totient is φ = 10506809088.

The previous prime is 21112320191. The next prime is 21112320221. The reversal of 21112320202 is 20202321112.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 20842408161 + 269912041 = 144369^2 + 16429^2 .

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, 2256478 + ... + 2265814.

Almost surely, 2^21112320202 is an apocalyptic number.

21112320202 is a deficient number, since it is larger than the sum of its proper divisors (10704300158).

21112320202 is a wasteful number, since it uses less digits than its factorization.

21112320202 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14505.

The product of its (nonzero) digits is 96, while the sum is 16.

Adding to 21112320202 its reverse (20202321112), we get a palindrome (41314641314).

The spelling of 21112320202 in words is "twenty-one billion, one hundred twelve million, three hundred twenty thousand, two hundred two".