21111020202 has 16 divisors (see below), whose sum is σ = 42640081632. Its totient is φ = 6967333200.

The previous prime is 21111020197. The next prime is 21111020207. The reversal of 21111020202 is 20202011112.

It is an interprime number because it is at equal distance from previous prime (21111020197) and next prime (21111020207).

It is not an unprimeable number, because it can be changed into a prime (21111020207) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 17417728 + ... + 17418939.

It is an arithmetic number, because the mean of its divisors is an integer number (2665005102).

Almost surely, 2^21111020202 is an apocalyptic number.

21111020202 is an abundant number, since it is smaller than the sum of its proper divisors (21529061430).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21111020202 is a wasteful number, since it uses less digits than its factorization.

21111020202 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 34836773.

The product of its (nonzero) digits is 16, while the sum is 12.

Adding to 21111020202 its reverse (20202011112), we get a palindrome (41313031314).

The spelling of 21111020202 in words is "twenty-one billion, one hundred eleven million, twenty thousand, two hundred two".