21337473733 has 4 divisors (see below), whose sum is σ = 21362372460. Its totient is φ = 21312575008.

The previous prime is 21337473709. The next prime is 21337473739. The reversal of 21337473733 is 33737473312.

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

It can be written as a sum of positive squares in 2 ways, for example, as 17198224164 + 4139249569 = 131142^2 + 64337^2 .

It is a cyclic number.

It is not a de Polignac number, because 21337473733 - 2¹⁷ = 21337342661 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 21337473733.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21337473739) 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, 12448078 + ... + 12449791.

It is an arithmetic number, because the mean of its divisors is an integer number (5340593115).

Almost surely, 2^21337473733 is an apocalyptic number.

It is an amenable number.

21337473733 is a deficient number, since it is larger than the sum of its proper divisors (24898727).

21337473733 is an equidigital number, since it uses as much as digits as its factorization.

21337473733 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24898726.

The product of its digits is 666792, while the sum is 43.

The spelling of 21337473733 in words is "twenty-one billion, three hundred thirty-seven million, four hundred seventy-three thousand, seven hundred thirty-three".