21010221111102 has 32 divisors (see below), whose sum is σ = 42466875429888. Its totient is φ = 6929124796896.

The previous prime is 21010221111073. The next prime is 21010221111107. The reversal of 21010221111102 is 20111112201012.

It is a happy number.

It is a super-2 number, since 2×21010221111102² (a number of 27 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21010221111107) by changing a digit.

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 15 ways as a sum of consecutive naturals, for example, 14729553 + ... + 16092860.

It is an arithmetic number, because the mean of its divisors is an integer number (1327089857184).

Almost surely, 2^{21010221111102} is an apocalyptic number.

21010221111102 is an abundant number, since it is smaller than the sum of its proper divisors (21456654318786).

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

21010221111102 is a wasteful number, since it uses less digits than its factorization.

21010221111102 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30823624.

The product of its (nonzero) digits is 16, while the sum is 15.

Adding to 21010221111102 its reverse (20111112201012), we get a palindrome (41121333312114).

The spelling of 21010221111102 in words is "twenty-one trillion, ten billion, two hundred twenty-one million, one hundred eleven thousand, one hundred two".