21758238233 has 8 divisors (see below), whose sum is σ = 22987428480. Its totient is φ = 20560975120.

The previous prime is 21758238221. The next prime is 21758238251. The reversal of 21758238233 is 33283285712.

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 21758238233 - 2¹⁸ = 21757976089 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21751238233) 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, 7980383 + ... + 7983108.

It is an arithmetic number, because the mean of its divisors is an integer number (2873428560).

Almost surely, 2^21758238233 is an apocalyptic number.

It is an amenable number.

21758238233 is a deficient number, since it is larger than the sum of its proper divisors (1229190247).

21758238233 is a wasteful number, since it uses less digits than its factorization.

21758238233 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15963567.

The product of its digits is 483840, while the sum is 44.

The spelling of 21758238233 in words is "twenty-one billion, seven hundred fifty-eight million, two hundred thirty-eight thousand, two hundred thirty-three".