21224515803652 has 36 divisors (see below), whose sum is σ = 43208493387024. Its totient is φ = 9095917194000.

The previous prime is 21224515803637. The next prime is 21224515803691. The reversal of 21224515803652 is 25630851542212.

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 11 ways as a sum of consecutive naturals, for example, 4123027 + ... + 7710277.

Almost surely, 2^{21224515803652} is an apocalyptic number.

It is an amenable number.

21224515803652 is an abundant number, since it is smaller than the sum of its proper divisors (21983977583372).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21224515803652 is a wasteful number, since it uses less digits than its factorization.

21224515803652 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3617456 (or 3617447 counting only the distinct ones).

The product of its (nonzero) digits is 1152000, while the sum is 46.

The spelling of 21224515803652 in words is "twenty-one trillion, two hundred twenty-four billion, five hundred fifteen million, eight hundred three thousand, six hundred fifty-two".