21052454025 has 24 divisors (see below), whose sum is σ = 35001197280. Its totient is φ = 11165242240.

The previous prime is 21052454011. The next prime is 21052454029. The reversal of 21052454025 is 52045425012.

It is not a de Polignac number, because 21052454025 - 2⁵ = 21052453993 is a prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 21052453983 and 21052454001.

It is not an unprimeable number, because it can be changed into a prime (21052454029) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 770652 + ... + 797501.

It is an arithmetic number, because the mean of its divisors is an integer number (1458383220).

Almost surely, 2^21052454025 is an apocalyptic number.

21052454025 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

21052454025 is a deficient number, since it is larger than the sum of its proper divisors (13948743255).

21052454025 is a wasteful number, since it uses less digits than its factorization.

21052454025 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1568345 (or 1568340 counting only the distinct ones).

The product of its (nonzero) digits is 16000, while the sum is 30.

Adding to 21052454025 its reverse (52045425012), we get a palindrome (73097879037).

The spelling of 21052454025 in words is "twenty-one billion, fifty-two million, four hundred fifty-four thousand, twenty-five".