21202012321313 has 4 divisors (see below), whose sum is σ = 21262763073300. Its totient is φ = 21141261569328.

The previous prime is 21202012321309. The next prime is 21202012321333. The reversal of 21202012321313 is 31312321020212.

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 12399356497984 + 8802655823329 = 3521272^2 + 2966927^2 .

It is a cyclic number.

It is not a de Polignac number, because 21202012321313 - 2² = 21202012321309 is a prime.

It is a super-3 number, since 3×21202012321313³ (a number of 41 digits) contains 333 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21202012321333) 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, 30375375470 + ... + 30375376167.

It is an arithmetic number, because the mean of its divisors is an integer number (5315690768325).

Almost surely, 2^{21202012321313} is an apocalyptic number.

It is an amenable number.

21202012321313 is a deficient number, since it is larger than the sum of its proper divisors (60750751987).

21202012321313 is an equidigital number, since it uses as much as digits as its factorization.

21202012321313 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 60750751986.

The product of its (nonzero) digits is 864, while the sum is 23.

Adding to 21202012321313 its reverse (31312321020212), we get a palindrome (52514333341525).

The spelling of 21202012321313 in words is "twenty-one trillion, two hundred two billion, twelve million, three hundred twenty-one thousand, three hundred thirteen".