21004055325 has 60 divisors (see below), whose sum is σ = 42443795328. Its totient is φ = 10183773600.

The previous prime is 21004055323. The next prime is 21004055333. The reversal of 21004055325 is 52355040012.

It is a happy number.

21004055325 is a `hidden beast` number, since 2 + 100 + 4 + 0 + 553 + 2 + 5 = 666.

It is not a de Polignac number, because 21004055325 - 2¹ = 21004055323 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21004055323) 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 59 ways as a sum of consecutive naturals, for example, 449197 + ... + 493746.

Almost surely, 2^21004055325 is an apocalyptic number.

21004055325 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

21004055325 is an abundant number, since it is smaller than the sum of its proper divisors (21439740003).

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

21004055325 is a wasteful number, since it uses less digits than its factorization.

21004055325 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 942976 (or 942962 counting only the distinct ones).

The product of its (nonzero) digits is 6000, while the sum is 27.

Adding to 21004055325 its reverse (52355040012), we get a palindrome (73359095337).

The spelling of 21004055325 in words is "twenty-one billion, four million, fifty-five thousand, three hundred twenty-five".