21221000120112 has 120 divisors (see below), whose sum is σ = 59367258158544. Its totient is φ = 6528992550912.

The previous prime is 21221000120107. The next prime is 21221000120113. The reversal of 21221000120112 is 21102100012212.

It is a junction number, because it is equal to n+sod(n) for n = 21221000120091 and 21221000120100.

It is not an unprimeable number, because it can be changed into a prime (21221000120113) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 102895048 + ... + 103101080.

Almost surely, 2^{21221000120112} is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21221000120112, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (29683629079272).

21221000120112 is an abundant number, since it is smaller than the sum of its proper divisors (38146258038432).

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

21221000120112 is a wasteful number, since it uses less digits than its factorization.

21221000120112 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 218767 (or 218748 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 15.

Adding to 21221000120112 its reverse (21102100012212), we get a palindrome (42323100132324).

The spelling of 21221000120112 in words is "twenty-one trillion, two hundred twenty-one billion, one hundred twenty thousand, one hundred twelve".