21020030233313 has 4 divisors (see below), whose sum is σ = 21072977413140. Its totient is φ = 20967083053488.

The previous prime is 21020030233289. The next prime is 21020030233361. The reversal of 21020030233313 is 31333203002012.

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 10130776020544 + 10889254212769 = 3182888^2 + 3299887^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21020030233313 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21020030235313) 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, 26473589318 + ... + 26473590111.

It is an arithmetic number, because the mean of its divisors is an integer number (5268244353285).

Almost surely, 2^{21020030233313} is an apocalyptic number.

It is an amenable number.

21020030233313 is a deficient number, since it is larger than the sum of its proper divisors (52947179827).

21020030233313 is an equidigital number, since it uses as much as digits as its factorization.

21020030233313 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 52947179826.

The product of its (nonzero) digits is 1944, while the sum is 23.

Adding to 21020030233313 its reverse (31333203002012), we get a palindrome (52353233235325).

The spelling of 21020030233313 in words is "twenty-one trillion, twenty billion, thirty million, two hundred thirty-three thousand, three hundred thirteen".