21121120011020 has 48 divisors (see below), whose sum is σ = 44876669604480. Its totient is φ = 8349060335616.

The previous prime is 21121120011011. The next prime is 21121120011071. The reversal of 21121120011020 is 2011002112112.

It is a super-2 number, since 2×21121120011020² (a number of 27 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 21121120010986 and 21121120011004.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 166349 + ... + 6501531.

It is an arithmetic number, because the mean of its divisors is an integer number (934930616760).

Almost surely, 2^{21121120011020} is an apocalyptic number.

21121120011020 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21121120011020 is an abundant number, since it is smaller than the sum of its proper divisors (23755549593460).

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

21121120011020 is a wasteful number, since it uses less digits than its factorization.

21121120011020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6337154 (or 6337152 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 14.

Adding to 21121120011020 its reverse (2011002112112), we get a palindrome (23132122123132).

The spelling of 21121120011020 in words is "twenty-one trillion, one hundred twenty-one billion, one hundred twenty million, eleven thousand, twenty".