21066436415533 has 8 divisors (see below), whose sum is σ = 21088972477440. Its totient is φ = 21043911323760.

The previous prime is 21066436415509. The next prime is 21066436415539. The reversal of 21066436415533 is 33551463466012.

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 21066436415533 - 2²¹ = 21066434318381 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21066436415539) 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, 1103091 + ... + 6584047.

It is an arithmetic number, because the mean of its divisors is an integer number (2636121559680).

Almost surely, 2^{21066436415533} is an apocalyptic number.

It is an amenable number.

21066436415533 is a deficient number, since it is larger than the sum of its proper divisors (22536061907).

21066436415533 is a wasteful number, since it uses less digits than its factorization.

21066436415533 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5485067.

The product of its (nonzero) digits is 4665600, while the sum is 49.

The spelling of 21066436415533 in words is "twenty-one trillion, sixty-six billion, four hundred thirty-six million, four hundred fifteen thousand, five hundred thirty-three".