21073453313 has 4 divisors (see below), whose sum is σ = 22989221808. Its totient is φ = 19157684820.

The previous prime is 21073453253. The next prime is 21073453321. The reversal of 21073453313 is 31335437012.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 21073453313 - 2⁸ = 21073453057 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 21073453313.

It is not an unprimeable number, because it can be changed into a prime (21073453363) 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, 957884231 + ... + 957884252.

It is an arithmetic number, because the mean of its divisors is an integer number (5747305452).

Almost surely, 2^21073453313 is an apocalyptic number.

It is an amenable number.

21073453313 is a deficient number, since it is larger than the sum of its proper divisors (1915768495).

21073453313 is a wasteful number, since it uses less digits than its factorization.

21073453313 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1915768494.

The product of its (nonzero) digits is 22680, while the sum is 32.

The spelling of 21073453313 in words is "twenty-one billion, seventy-three million, four hundred fifty-three thousand, three hundred thirteen".