21054104425 has 12 divisors (see below), whose sum is σ = 26110824336. Its totient is φ = 16840874000.

The previous prime is 21054104399. The next prime is 21054104453. The reversal of 21054104425 is 52440145012.

It is not a de Polignac number, because 21054104425 - 2¹⁵ = 21054071657 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21054104393 and 21054104402.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 129762 + ... + 242788.

It is an arithmetic number, because the mean of its divisors is an integer number (2175902028).

Almost surely, 2^21054104425 is an apocalyptic number.

21054104425 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

21054104425 is a deficient number, since it is larger than the sum of its proper divisors (5056719911).

21054104425 is a wasteful number, since it uses less digits than its factorization.

21054104425 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 120488 (or 120483 counting only the distinct ones).

The product of its (nonzero) digits is 6400, while the sum is 28.

Adding to 21054104425 its reverse (52440145012), we get a palindrome (73494249437).

The spelling of 21054104425 in words is "twenty-one billion, fifty-four million, one hundred four thousand, four hundred twenty-five".