21123300454425 has 96 divisors (see below), whose sum is σ = 41794316242560. Its totient is φ = 10397897683200.

The previous prime is 21123300454423. The next prime is 21123300454429. The reversal of 21123300454425 is 52445400332112.

It is a happy number.

21123300454425 is a `hidden beast` number, since 21 + 123 + 30 + 0 + 45 + 442 + 5 = 666.

It is not a de Polignac number, because 21123300454425 - 2¹ = 21123300454423 is a prime.

It is a super-4 number, since 4×21123300454425⁴ (a number of 54 digits) contains 4444 as substring. Note that it is a super-d number also for d = 2.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 21123300454425.

It is not an unprimeable number, because it can be changed into a prime (21123300454423) by changing a digit.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 74103022 + ... + 74387528.

It is an arithmetic number, because the mean of its divisors is an integer number (435357460860).

Almost surely, 2^{21123300454425} is an apocalyptic number.

21123300454425 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

21123300454425 is a deficient number, since it is larger than the sum of its proper divisors (20671015788135).

21123300454425 is a wasteful number, since it uses less digits than its factorization.

21123300454425 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 293000 (or 292989 counting only the distinct ones).

The product of its (nonzero) digits is 115200, while the sum is 36.

Adding to 21123300454425 its reverse (52445400332112), we get a palindrome (73568700786537).

The spelling of 21123300454425 in words is "twenty-one trillion, one hundred twenty-three billion, three hundred million, four hundred fifty-four thousand, four hundred twenty-five".