21121021121120 has 96 divisors (see below), whose sum is σ = 50822179168320. Its totient is φ = 8293042759680.

The previous prime is 21121021121117. The next prime is 21121021121131. The reversal of 21121021121120 is 2112112012112.

It is a congruent number.

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, 1458047 + ... + 6660926.

It is an arithmetic number, because the mean of its divisors is an integer number (529397699670).

Almost surely, 2^{21121021121120} is an apocalyptic number.

21121021121120 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21121021121120 is an abundant number, since it is smaller than the sum of its proper divisors (29701158047200).

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

21121021121120 is a wasteful number, since it uses less digits than its factorization.

21121021121120 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8119288 (or 8119280 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 17.

Adding to 21121021121120 its reverse (2112112012112), we get a palindrome (23233133133232).

The spelling of 21121021121120 in words is "twenty-one trillion, one hundred twenty-one billion, twenty-one million, one hundred twenty-one thousand, one hundred twenty".