21507600449 has 8 divisors (see below), whose sum is σ = 23623909440. Its totient is φ = 19489724496.

The previous prime is 21507600427. The next prime is 21507600467. The reversal of 21507600449 is 94400670512.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 21507600449 - 2⁸ = 21507600193 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21507600409) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 24607802 + ... + 24608675.

It is an arithmetic number, because the mean of its divisors is an integer number (2952988680).

Almost surely, 2^21507600449 is an apocalyptic number.

It is an amenable number.

21507600449 is a deficient number, since it is larger than the sum of its proper divisors (2116308991).

21507600449 is a wasteful number, since it uses less digits than its factorization.

21507600449 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 49216519.

The product of its (nonzero) digits is 60480, while the sum is 38.

The spelling of 21507600449 in words is "twenty-one billion, five hundred seven million, six hundred thousand, four hundred forty-nine".