21112636025 has 24 divisors (see below), whose sum is σ = 29102970624. Its totient is φ = 15087931200.

The previous prime is 21112635997. The next prime is 21112636043. The reversal of 21112636025 is 52063621112.

It is not a de Polignac number, because 21112636025 - 2⁶ = 21112635961 is a prime.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1037699 + ... + 1057848.

It is an arithmetic number, because the mean of its divisors is an integer number (1212623776).

Almost surely, 2^21112636025 is an apocalyptic number.

21112636025 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

21112636025 is a deficient number, since it is larger than the sum of its proper divisors (7990334599).

21112636025 is a wasteful number, since it uses less digits than its factorization.

21112636025 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2095601 (or 2095596 counting only the distinct ones).

The product of its (nonzero) digits is 4320, while the sum is 29.

The spelling of 21112636025 in words is "twenty-one billion, one hundred twelve million, six hundred thirty-six thousand, twenty-five".