21200544415 has 8 divisors (see below), whose sum is σ = 25444589040. Its totient is φ = 16957811712.

The previous prime is 21200544397. The next prime is 21200544437. The reversal of 21200544415 is 51444500212.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21200544415 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 292069 + ... + 357358.

It is an arithmetic number, because the mean of its divisors is an integer number (3180573630).

Almost surely, 2^21200544415 is an apocalyptic number.

21200544415 is a deficient number, since it is larger than the sum of its proper divisors (4244044625).

21200544415 is an equidigital number, since it uses as much as digits as its factorization.

21200544415 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 655961.

The product of its (nonzero) digits is 6400, while the sum is 28.

The spelling of 21200544415 in words is "twenty-one billion, two hundred million, five hundred forty-four thousand, four hundred fifteen".