21355347206433 has 8 divisors (see below), whose sum is σ = 28476013739296. Its totient is φ = 14235789405600.

The previous prime is 21355347206399. The next prime is 21355347206447. The reversal of 21355347206433 is 33460274355312.

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

It is not a de Polignac number, because 21355347206433 - 2²¹ = 21355345109281 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21355343206433) 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, 277138063 + ... + 277215108.

It is an arithmetic number, because the mean of its divisors is an integer number (3559501717412).

Almost surely, 2^{21355347206433} is an apocalyptic number.

It is an amenable number.

21355347206433 is a deficient number, since it is larger than the sum of its proper divisors (7120666532863).

21355347206433 is a wasteful number, since it uses less digits than its factorization.

21355347206433 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 554366015.

The product of its (nonzero) digits is 5443200, while the sum is 48.

The spelling of 21355347206433 in words is "twenty-one trillion, three hundred fifty-five billion, three hundred forty-seven million, two hundred six thousand, four hundred thirty-three".