21120101111020 has 12 divisors (see below), whose sum is σ = 44352212333184. Its totient is φ = 8448040444400.

The previous prime is 21120101111003. The next prime is 21120101111027. The reversal of 21120101111020 is 2011110102112.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (21120101111027) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 528002527756 + ... + 528002527795.

It is an arithmetic number, because the mean of its divisors is an integer number (3696017694432).

Almost surely, 2^{21120101111020} is an apocalyptic number.

21120101111020 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21120101111020 is an abundant number, since it is smaller than the sum of its proper divisors (23232111222164).

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

21120101111020 is a wasteful number, since it uses less digits than its factorization.

21120101111020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1056005055560 (or 1056005055558 counting only the distinct ones).

The product of its (nonzero) digits is 8, while the sum is 13.

Adding to 21120101111020 its reverse (2011110102112), we get a palindrome (23131211213132).

The spelling of 21120101111020 in words is "twenty-one trillion, one hundred twenty billion, one hundred one million, one hundred eleven thousand, twenty".