21094610239 has 4 divisors (see below), whose sum is σ = 21114914080. Its totient is φ = 21074306400.

The previous prime is 21094610231. The next prime is 21094610261. The reversal of 21094610239 is 93201649012.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 21094610239 - 2³ = 21094610231 is a prime.

It is a super-2 number, since 2×21094610239² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21094610198 and 21094610207.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21094610231) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10150362 + ... + 10152439.

It is an arithmetic number, because the mean of its divisors is an integer number (5278728520).

Almost surely, 2^21094610239 is an apocalyptic number.

21094610239 is a deficient number, since it is larger than the sum of its proper divisors (20303841).

21094610239 is a wasteful number, since it uses less digits than its factorization.

21094610239 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20303840.

The product of its (nonzero) digits is 23328, while the sum is 37.

The spelling of 21094610239 in words is "twenty-one billion, ninety-four million, six hundred ten thousand, two hundred thirty-nine".