21004314125 has 8 divisors (see below), whose sum is σ = 26213384184. Its totient is φ = 16803451200.

The previous prime is 21004314119. The next prime is 21004314131. The reversal of 21004314125 is 52141340012.

It is an interprime number because it is at equal distance from previous prime (21004314119) and next prime (21004314131).

It can be written as a sum of positive squares in 4 ways, for example, as 494350756 + 20509963369 = 22234^2 + 143213^2 .

It is not a de Polignac number, because 21004314125 - 2⁴ = 21004314109 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 21004314125.

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, 84017132 + ... + 84017381.

It is an arithmetic number, because the mean of its divisors is an integer number (3276673023).

Almost surely, 2^21004314125 is an apocalyptic number.

21004314125 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

21004314125 is a deficient number, since it is larger than the sum of its proper divisors (5209070059).

21004314125 is an equidigital number, since it uses as much as digits as its factorization.

21004314125 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 168034528 (or 168034518 counting only the distinct ones).

The product of its (nonzero) digits is 960, while the sum is 23.

Adding to 21004314125 its reverse (52141340012), we get a palindrome (73145654137).

The spelling of 21004314125 in words is "twenty-one billion, four million, three hundred fourteen thousand, one hundred twenty-five".