21213601550243 has 8 divisors (see below), whose sum is σ = 21834202328400. Its totient is φ = 20595488150880.

The previous prime is 21213601550201. The next prime is 21213601550261. The reversal of 21213601550243 is 34205510631212.

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 21213601550243 - 2¹⁰ = 21213601549219 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21213601550143) 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, 621827393 + ... + 621861506.

It is an arithmetic number, because the mean of its divisors is an integer number (2729275291050).

Almost surely, 2^{21213601550243} is an apocalyptic number.

21213601550243 is a deficient number, since it is larger than the sum of its proper divisors (620600778157).

21213601550243 is a wasteful number, since it uses less digits than its factorization.

21213601550243 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1243689397.

The product of its (nonzero) digits is 43200, while the sum is 35.

The spelling of 21213601550243 in words is "twenty-one trillion, two hundred thirteen billion, six hundred one million, five hundred fifty thousand, two hundred forty-three".