21000410025 has 48 divisors (see below), whose sum is σ = 40183142400. Its totient is φ = 9478647360.

The previous prime is 21000410023. The next prime is 21000410051. The reversal of 21000410025 is 52001400012.

It is not a de Polignac number, because 21000410025 - 2¹ = 21000410023 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (15).

It is a junction number, because it is equal to n+sod(n) for n = 21000409986 and 21000410013.

It is not an unprimeable number, because it can be changed into a prime (21000410021) 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 47 ways as a sum of consecutive naturals, for example, 211695 + ... + 294644.

It is an arithmetic number, because the mean of its divisors is an integer number (837148800).

Almost surely, 2^21000410025 is an apocalyptic number.

21000410025 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

21000410025 is a deficient number, since it is larger than the sum of its proper divisors (19182732375).

21000410025 is a wasteful number, since it uses less digits than its factorization.

21000410025 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 506438 (or 506433 counting only the distinct ones).

The product of its (nonzero) digits is 80, while the sum is 15.

Adding to 21000410025 its reverse (52001400012), we get a palindrome (73001810037).

The spelling of 21000410025 in words is "twenty-one billion, four hundred ten thousand, twenty-five".