21311113202 has 8 divisors (see below), whose sum is σ = 31968864300. Its totient is φ = 10654825104.

The previous prime is 21311113183. The next prime is 21311113259. The reversal of 21311113202 is 20231111312.

It can be written as a sum of positive squares in 2 ways, for example, as 20079173401 + 1231939801 = 141701^2 + 35099^2 .

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

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 328577 + ... + 388052.

Almost surely, 2^21311113202 is an apocalyptic number.

21311113202 is a deficient number, since it is larger than the sum of its proper divisors (10657751098).

21311113202 is a wasteful number, since it uses less digits than its factorization.

21311113202 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 731500.

The product of its (nonzero) digits is 72, while the sum is 17.

Adding to 21311113202 its reverse (20231111312), we get a palindrome (41542224514).

The spelling of 21311113202 in words is "twenty-one billion, three hundred eleven million, one hundred thirteen thousand, two hundred two".