21355073013 has 8 divisors (see below), whose sum is σ = 29391928576. Its totient is φ = 13777466400.

The previous prime is 21355072967. The next prime is 21355073017. The reversal of 21355073013 is 31037055312.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 21355073013 - 2¹³ = 21355064821 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21355073017) 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, 114812128 + ... + 114812313.

It is an arithmetic number, because the mean of its divisors is an integer number (3673991072).

Almost surely, 2^21355073013 is an apocalyptic number.

It is an amenable number.

21355073013 is a deficient number, since it is larger than the sum of its proper divisors (8036855563).

21355073013 is a wasteful number, since it uses less digits than its factorization.

21355073013 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 229624475.

The product of its (nonzero) digits is 9450, while the sum is 30.

The spelling of 21355073013 in words is "twenty-one billion, three hundred fifty-five million, seventy-three thousand, thirteen".