21120220121120 has 24 divisors (see below), whose sum is σ = 49896520036524. Its totient is φ = 8448088048384.

The previous prime is 21120220121111. The next prime is 21120220121159. The reversal of 21120220121120 is 2112102202112.

It can be written as a sum of positive squares in 2 ways, for example, as 18080762613904 + 3039457507216 = 4252148^2 + 1743404^2 .

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, 66000687719 + ... + 66000688038.

Almost surely, 2^{21120220121120} is an apocalyptic number.

21120220121120 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21120220121120 is an abundant number, since it is smaller than the sum of its proper divisors (28776299915404).

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

21120220121120 is a wasteful number, since it uses less digits than its factorization.

21120220121120 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 132001375772 (or 132001375764 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 17.

Adding to 21120220121120 its reverse (2112102202112), we get a palindrome (23232322323232).

The spelling of 21120220121120 in words is "twenty-one trillion, one hundred twenty billion, two hundred twenty million, one hundred twenty-one thousand, one hundred twenty".