21221201121102 has 48 divisors (see below), whose sum is σ = 47538878119200. Its totient is φ = 6836360060736.

The previous prime is 21221201121073. The next prime is 21221201121163. The reversal of 21221201121102 is 20112110212212.

21221201121102 is a `hidden beast` number, since 21 + 221 + 201 + 121 + 102 = 666.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 106825818 + ... + 107024285.

It is an arithmetic number, because the mean of its divisors is an integer number (990393294150).

Almost surely, 2^{21221201121102} is an apocalyptic number.

21221201121102 is an abundant number, since it is smaller than the sum of its proper divisors (26317676998098).

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

21221201121102 is a wasteful number, since it uses less digits than its factorization.

21221201121102 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 213850297 (or 213850294 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 18.

Adding to 21221201121102 its reverse (20112110212212), we get a palindrome (41333311333314).

The spelling of 21221201121102 in words is "twenty-one trillion, two hundred twenty-one billion, two hundred one million, one hundred twenty-one thousand, one hundred two".