21210313320023 has 4 divisors (see below), whose sum is σ = 21224577150240. Its totient is φ = 21196049489808.

The previous prime is 21210313319963. The next prime is 21210313320067. The reversal of 21210313320023 is 32002331301212.

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

It is a cyclic number.

It is not a de Polignac number, because 21210313320023 - 2⁶ = 21210313319959 is a prime.

It is a super-2 number, since 2×21210313320023² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21210313320523) 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, 7131912878 + ... + 7131915851.

It is an arithmetic number, because the mean of its divisors is an integer number (5306144287560).

Almost surely, 2^{21210313320023} is an apocalyptic number.

21210313320023 is a deficient number, since it is larger than the sum of its proper divisors (14263830217).

21210313320023 is a wasteful number, since it uses less digits than its factorization.

21210313320023 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14263830216.

The product of its (nonzero) digits is 1296, while the sum is 23.

Adding to 21210313320023 its reverse (32002331301212), we get a palindrome (53212644621235).

The spelling of 21210313320023 in words is "twenty-one trillion, two hundred ten billion, three hundred thirteen million, three hundred twenty thousand, twenty-three".