21210110121102 has 128 divisors (see below), whose sum is σ = 49053928734720. Its totient is φ = 5988583722240.

The previous prime is 21210110121047. The next prime is 21210110121103. The reversal of 21210110121102 is 20112101101212.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21210110121103) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 7976723049 + ... + 7976725707.

It is an arithmetic number, because the mean of its divisors is an integer number (383233818240).

Almost surely, 2^{21210110121102} is an apocalyptic number.

21210110121102 is an abundant number, since it is smaller than the sum of its proper divisors (27843818613618).

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

21210110121102 is a wasteful number, since it uses less digits than its factorization.

21210110121102 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5958.

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

Adding to 21210110121102 its reverse (20112101101212), we get a palindrome (41322211222314).

The spelling of 21210110121102 in words is "twenty-one trillion, two hundred ten billion, one hundred ten million, one hundred twenty-one thousand, one hundred two".