21120202200123 has 192 divisors, whose sum is σ = 35160589900800. Its totient is φ = 12120700032000.

The previous prime is 21120202200121. The next prime is 21120202200277. The reversal of 21120202200123 is 32100220202112.

21120202200123 is a `hidden beast` number, since 21 + 120 + 202 + 200 + 123 = 666.

It is not a de Polignac number, because 21120202200123 - 2¹ = 21120202200121 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21120202200096 and 21120202200105.

It is not an unprimeable number, because it can be changed into a prime (21120202200121) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 191 ways as a sum of consecutive naturals, for example, 11312373036 + ... + 11312374902.

It is an arithmetic number, because the mean of its divisors is an integer number (183128072400).

Almost surely, 2^{21120202200123} is an apocalyptic number.

21120202200123 is a deficient number, since it is larger than the sum of its proper divisors (14040387700677).

21120202200123 is a wasteful number, since it uses less digits than its factorization.

21120202200123 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2562 (or 2559 counting only the distinct ones).

The product of its (nonzero) digits is 192, while the sum is 18.

Adding to 21120202200123 its reverse (32100220202112), we get a palindrome (53220422402235).

The spelling of 21120202200123 in words is "twenty-one trillion, one hundred twenty billion, two hundred two million, two hundred thousand, one hundred twenty-three".