21111120202 has 8 divisors (see below), whose sum is σ = 31683449700. Its totient is φ = 10549970304.

The previous prime is 21111120181. The next prime is 21111120241. The reversal of 21111120202 is 20202111112.

It can be written as a sum of positive squares in 2 ways, for example, as 17940191481 + 3170928721 = 133941^2 + 56311^2 .

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, 2790177 + ... + 2797732.

Almost surely, 2^21111120202 is an apocalyptic number.

21111120202 is a deficient number, since it is larger than the sum of its proper divisors (10572329498).

21111120202 is a wasteful number, since it uses less digits than its factorization.

21111120202 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5589800.

The product of its (nonzero) digits is 16, while the sum is 13.

Adding to 21111120202 its reverse (20202111112), we get a palindrome (41313231314).

The spelling of 21111120202 in words is "twenty-one billion, one hundred eleven million, one hundred twenty thousand, two hundred two".