21036504415 has 8 divisors (see below), whose sum is σ = 25479729360. Its totient is φ = 16671920832.

The previous prime is 21036504407. The next prime is 21036504443. The reversal of 21036504415 is 51440563012.

It is a happy number.

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 21036504415 - 2³ = 21036504407 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 19659750 + ... + 19660819.

It is an arithmetic number, because the mean of its divisors is an integer number (3184966170).

Almost surely, 2^21036504415 is an apocalyptic number.

21036504415 is a deficient number, since it is larger than the sum of its proper divisors (4443224945).

21036504415 is a wasteful number, since it uses less digits than its factorization.

21036504415 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 39320681.

The product of its (nonzero) digits is 14400, while the sum is 31.

The spelling of 21036504415 in words is "twenty-one billion, thirty-six million, five hundred four thousand, four hundred fifteen".