21043112025 has 24 divisors (see below), whose sum is σ = 37467532480. Its totient is φ = 10359685440.

The previous prime is 21043112011. The next prime is 21043112039. The reversal of 21043112025 is 52021134012.

It is an interprime number because it is at equal distance from previous prime (21043112011) and next prime (21043112039).

It is not a de Polignac number, because 21043112025 - 2²⁹ = 20506241113 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21043111992 and 21043112010.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 10790365 + ... + 10792314.

Almost surely, 2^21043112025 is an apocalyptic number.

21043112025 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

21043112025 is a deficient number, since it is larger than the sum of its proper divisors (16424420455).

21043112025 is a wasteful number, since it uses less digits than its factorization.

21043112025 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21582705 (or 21582700 counting only the distinct ones).

The product of its (nonzero) digits is 480, while the sum is 21.

Adding to 21043112025 its reverse (52021134012), we get a palindrome (73064246037).

The spelling of 21043112025 in words is "twenty-one billion, forty-three million, one hundred twelve thousand, twenty-five".