21020122112 has 88 divisors (see below), whose sum is σ = 45915716592. Its totient is φ = 9538764800.

The previous prime is 21020122093. The next prime is 21020122129. The reversal of 21020122112 is 21122102012.

It is a tau number, because it is divible by the number of its divisors (88).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9246608 + ... + 9248880.

Almost surely, 2^21020122112 is an apocalyptic number.

21020122112 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21020122112, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (22957858296).

21020122112 is an abundant number, since it is smaller than the sum of its proper divisors (24895594480).

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

21020122112 is a wasteful number, since it uses less digits than its factorization.

21020122112 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3125 (or 3107 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 14.

Adding to 21020122112 its reverse (21122102012), we get a palindrome (42142224124).

It can be divided in two parts, 2102012 and 2112, that multiplied together give a palindrome (4439449344).

The spelling of 21020122112 in words is "twenty-one billion, twenty million, one hundred twenty-two thousand, one hundred twelve".