21011004034125 has 32 divisors (see below), whose sum is σ = 39956926533888. Its totient is φ = 9605030414400.

The previous prime is 21011004034117. The next prime is 21011004034127. The reversal of 21011004034125 is 52143040011012.

It is not a de Polignac number, because 21011004034125 - 2³ = 21011004034117 is a prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 21011004034095 and 21011004034104.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21011004034127) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 4002093382 + ... + 4002098631.

It is an arithmetic number, because the mean of its divisors is an integer number (1248653954184).

Almost surely, 2^{21011004034125} is an apocalyptic number.

21011004034125 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

21011004034125 is a deficient number, since it is larger than the sum of its proper divisors (18945922499763).

21011004034125 is an equidigital number, since it uses as much as digits as its factorization.

21011004034125 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8004192038 (or 8004192028 counting only the distinct ones).

The product of its (nonzero) digits is 960, while the sum is 24.

Adding to 21011004034125 its reverse (52143040011012), we get a palindrome (73154044045137).

The spelling of 21011004034125 in words is "twenty-one trillion, eleven billion, four million, thirty-four thousand, one hundred twenty-five".