21047273013 has 24 divisors (see below), whose sum is σ = 30421802880. Its totient is φ = 12937666560.

The previous prime is 21047272979. The next prime is 21047273017. The reversal of 21047273013 is 31037274012.

It is not a de Polignac number, because 21047273013 - 2⁶ = 21047272949 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21047273017) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 439093 + ... + 484661.

It is an arithmetic number, because the mean of its divisors is an integer number (1267575120).

Almost surely, 2^21047273013 is an apocalyptic number.

It is an amenable number.

21047273013 is a deficient number, since it is larger than the sum of its proper divisors (9374529867).

21047273013 is a wasteful number, since it uses less digits than its factorization.

21047273013 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 46509 (or 46496 counting only the distinct ones).

The product of its (nonzero) digits is 7056, while the sum is 30.

Subtracting 21047273013 from its reverse (31037274012), we obtain a palindrome (9990000999).

The spelling of 21047273013 in words is "twenty-one billion, forty-seven million, two hundred seventy-three thousand, thirteen".