21354204025 has 72 divisors (see below), whose sum is σ = 35014495040. Its totient is φ = 12610857600.

The previous prime is 21354204023. The next prime is 21354204031. The reversal of 21354204025 is 52040245312.

It is not a de Polignac number, because 21354204025 - 2¹ = 21354204023 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21354203984 and 21354204002.

It is not an unprimeable number, because it can be changed into a prime (21354204023) by changing a digit.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 375787 + ... + 428863.

Almost surely, 2^21354204025 is an apocalyptic number.

21354204025 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

21354204025 is a deficient number, since it is larger than the sum of its proper divisors (13660291015).

21354204025 is a wasteful number, since it uses less digits than its factorization.

21354204025 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 53135 (or 53119 counting only the distinct ones).

The product of its (nonzero) digits is 9600, while the sum is 28.

Adding to 21354204025 its reverse (52040245312), we get a palindrome (73394449337).

The spelling of 21354204025 in words is "twenty-one billion, three hundred fifty-four million, two hundred four thousand, twenty-five".