21033132313 has 8 divisors (see below), whose sum is σ = 21079773288. Its totient is φ = 20986527744.

The previous prime is 21033132311. The next prime is 21033132347. The reversal of 21033132313 is 31323133012.

It can be written as a sum of positive squares in 4 ways, for example, as 1117431184 + 19915701129 = 33428^2 + 141123^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 21033132313 - 2¹ = 21033132311 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21033132311) 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, 1373145 + ... + 1388377.

It is an arithmetic number, because the mean of its divisors is an integer number (2634971661).

Almost surely, 2^21033132313 is an apocalyptic number.

It is an amenable number.

21033132313 is a deficient number, since it is larger than the sum of its proper divisors (46640975).

21033132313 is a wasteful number, since it uses less digits than its factorization.

21033132313 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18203.

The product of its (nonzero) digits is 972, while the sum is 22.

Adding to 21033132313 its reverse (31323133012), we get a palindrome (52356265325).

The spelling of 21033132313 in words is "twenty-one billion, thirty-three million, one hundred thirty-two thousand, three hundred thirteen".