21313203312021 has 16 divisors (see below), whose sum is σ = 28451267919360. Its totient is φ = 14191971310080.

The previous prime is 21313203311957. The next prime is 21313203312053. The reversal of 21313203312021 is 12021330231312.

It is not a de Polignac number, because 21313203312021 - 2⁶ = 21313203311957 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21313203311982 and 21313203312000.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21313203312091) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 131774361 + ... + 131936001.

It is an arithmetic number, because the mean of its divisors is an integer number (1778204244960).

Almost surely, 2^{21313203312021} is an apocalyptic number.

It is an amenable number.

21313203312021 is a deficient number, since it is larger than the sum of its proper divisors (7138064607339).

21313203312021 is a wasteful number, since it uses less digits than its factorization.

21313203312021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 213436.

The product of its (nonzero) digits is 1296, while the sum is 24.

Adding to 21313203312021 its reverse (12021330231312), we get a palindrome (33334533543333).

The spelling of 21313203312021 in words is "twenty-one trillion, three hundred thirteen billion, two hundred three million, three hundred twelve thousand, twenty-one".