21258426233 has 12 divisors (see below), whose sum is σ = 23405276160. Its totient is φ = 19293937080.

The previous prime is 21258426199. The next prime is 21258426239. The reversal of 21258426233 is 33262485212.

It is a happy number.

It is not a de Polignac number, because 21258426233 - 2⁸ = 21258425977 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21258426239) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 71273 + ... + 218166.

It is an arithmetic number, because the mean of its divisors is an integer number (1950439680).

Almost surely, 2^21258426233 is an apocalyptic number.

It is an amenable number.

21258426233 is a deficient number, since it is larger than the sum of its proper divisors (2146849927).

21258426233 is a wasteful number, since it uses less digits than its factorization.

21258426233 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 290068 (or 290057 counting only the distinct ones).

The product of its digits is 138240, while the sum is 38.

The spelling of 21258426233 in words is "twenty-one billion, two hundred fifty-eight million, four hundred twenty-six thousand, two hundred thirty-three".