21579739103 has 4 divisors (see below), whose sum is σ = 23239719048. Its totient is φ = 19919759160.

The previous prime is 21579739099. The next prime is 21579739109. The reversal of 21579739103 is 30193797512.

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 21579739103 - 2² = 21579739099 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21579739109) 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, 829989953 + ... + 829989978.

It is an arithmetic number, because the mean of its divisors is an integer number (5809929762).

Almost surely, 2^21579739103 is an apocalyptic number.

21579739103 is a deficient number, since it is larger than the sum of its proper divisors (1659979945).

21579739103 is a wasteful number, since it uses less digits than its factorization.

21579739103 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1659979944.

The product of its (nonzero) digits is 357210, while the sum is 47.

The spelling of 21579739103 in words is "twenty-one billion, five hundred seventy-nine million, seven hundred thirty-nine thousand, one hundred three".