21033234125 has 8 divisors (see below), whose sum is σ = 26249476344. Its totient is φ = 16826587200.

The previous prime is 21033234107. The next prime is 21033234163. The reversal of 21033234125 is 52143233012.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 1983989764 + 19049244361 = 44542^2 + 138019^2 .

It is a de Polignac number, because none of the positive numbers 2^k-21033234125 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21033234094 and 21033234103.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 84132812 + ... + 84133061.

It is an arithmetic number, because the mean of its divisors is an integer number (3281184543).

Almost surely, 2^21033234125 is an apocalyptic number.

21033234125 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

21033234125 is a deficient number, since it is larger than the sum of its proper divisors (5216242219).

21033234125 is an equidigital number, since it uses as much as digits as its factorization.

21033234125 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 168265888 (or 168265878 counting only the distinct ones).

The product of its (nonzero) digits is 4320, while the sum is 26.

Adding to 21033234125 its reverse (52143233012), we get a palindrome (73176467137).

The spelling of 21033234125 in words is "twenty-one billion, thirty-three million, two hundred thirty-four thousand, one hundred twenty-five".