21211110102 has 96 divisors (see below), whose sum is σ = 54581016672. Its totient is φ = 5442909696.

The previous prime is 21211110097. The next prime is 21211110113. The reversal of 21211110102 is 20101111212.

It is a super-2 number, since 2×21211110102² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 66418 + ... + 216410.

It is an arithmetic number, because the mean of its divisors is an integer number (568552257).

Almost surely, 2^21211110102 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21211110102, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (27290508336).

21211110102 is an abundant number, since it is smaller than the sum of its proper divisors (33369906570).

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

21211110102 is a wasteful number, since it uses less digits than its factorization.

21211110102 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 150062 (or 150055 counting only the distinct ones).

The product of its (nonzero) digits is 8, while the sum is 12.

Adding to 21211110102 its reverse (20101111212), we get a palindrome (41312221314).

It can be divided in two parts, 21211110 and 102, that added together give a palindrome (21211212).

The spelling of 21211110102 in words is "twenty-one billion, two hundred eleven million, one hundred ten thousand, one hundred two".