21211101102102 has 16 divisors (see below), whose sum is σ = 42450846517872. Its totient is φ = 7065592981760.

The previous prime is 21211101102091. The next prime is 21211101102109. The reversal of 21211101102102 is 20120110111212.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21211101102109) 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, 1193503443 + ... + 1193521214.

It is an arithmetic number, because the mean of its divisors is an integer number (2653177907367).

Almost surely, 2^{21211101102102} is an apocalyptic number.

21211101102102 is an abundant number, since it is smaller than the sum of its proper divisors (21239745415770).

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

21211101102102 is a wasteful number, since it uses less digits than its factorization.

21211101102102 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2387026143.

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

Adding to 21211101102102 its reverse (20120110111212), we get a palindrome (41331211213314).

The spelling of 21211101102102 in words is "twenty-one trillion, two hundred eleven billion, one hundred one million, one hundred two thousand, one hundred two".