21683049225 has 12 divisors (see below), whose sum is σ = 35849308176. Its totient is φ = 11564292880.

The previous prime is 21683049221. The next prime is 21683049253. The reversal of 21683049225 is 52294038612.

It is not a de Polignac number, because 21683049225 - 2² = 21683049221 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21683049221) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 144553587 + ... + 144553736.

It is an arithmetic number, because the mean of its divisors is an integer number (2987442348).

Almost surely, 2^21683049225 is an apocalyptic number.

21683049225 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

21683049225 is a deficient number, since it is larger than the sum of its proper divisors (14166258951).

21683049225 is a wasteful number, since it uses less digits than its factorization.

21683049225 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 289107336 (or 289107331 counting only the distinct ones).

The product of its (nonzero) digits is 207360, while the sum is 42.

The spelling of 21683049225 in words is "twenty-one billion, six hundred eighty-three million, forty-nine thousand, two hundred twenty-five".