21111020020202 has 16 divisors (see below), whose sum is σ = 37073010768192. Its totient is φ = 8826907325280.

The previous prime is 21111020020199. The next prime is 21111020020217. The reversal of 21111020020202 is 20202002011112.

It is a Harshad number since it is a multiple of its sum of digits (14).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 18389389688 + ... + 18389390835.

It is an arithmetic number, because the mean of its divisors is an integer number (2317063173012).

Almost surely, 2^{21111020020202} is an apocalyptic number.

21111020020202 is a deficient number, since it is larger than the sum of its proper divisors (15961990747990).

21111020020202 is a wasteful number, since it uses less digits than its factorization.

21111020020202 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 36778780573.

The product of its (nonzero) digits is 32, while the sum is 14.

Adding to 21111020020202 its reverse (20202002011112), we get a palindrome (41313022031314).

The spelling of 21111020020202 in words is "twenty-one trillion, one hundred eleven billion, twenty million, twenty thousand, two hundred two".