21020121110112 has 24 divisors (see below), whose sum is σ = 55177817914296. Its totient is φ = 7006707036672.

The previous prime is 21020121110083. The next prime is 21020121110147. The reversal of 21020121110112 is 21101112102012.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (24).

It is a super-2 number, since 2×21020121110112² (a number of 27 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 21020121110091 and 21020121110100.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 109479797353 + ... + 109479797544.

It is an arithmetic number, because the mean of its divisors is an integer number (2299075746429).

Almost surely, 2^{21020121110112} is an apocalyptic number.

It is an amenable number.

21020121110112 is an abundant number, since it is smaller than the sum of its proper divisors (34157696804184).

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

21020121110112 is a wasteful number, since it uses less digits than its factorization.

21020121110112 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 218959594910 (or 218959594902 counting only the distinct ones).

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

Adding to 21020121110112 its reverse (21101112102012), we get a palindrome (42121233212124).

The spelling of 21020121110112 in words is "twenty-one trillion, twenty billion, one hundred twenty-one million, one hundred ten thousand, one hundred twelve".