21211110012102 has 16 divisors (see below), whose sum is σ = 42424375751472. Its totient is φ = 7070010716160.

The previous prime is 21211110012083. The next prime is 21211110012107. The reversal of 21211110012102 is 20121001111212.

It is a happy number.

It is a super-3 number, since 3×21211110012102³ (a number of 41 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21211110012107) 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, 89694043 + ... + 89930214.

It is an arithmetic number, because the mean of its divisors is an integer number (2651523484467).

Almost surely, 2^{21211110012102} is an apocalyptic number.

21211110012102 is an abundant number, since it is smaller than the sum of its proper divisors (21213265739370).

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

21211110012102 is a wasteful number, since it uses less digits than its factorization.

21211110012102 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 179643943.

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

Adding to 21211110012102 its reverse (20121001111212), we get a palindrome (41332111123314).

The spelling of 21211110012102 in words is "twenty-one trillion, two hundred eleven billion, one hundred ten million, twelve thousand, one hundred two".