21203111313023 has 4 divisors (see below), whose sum is σ = 21408966762768. Its totient is φ = 20997255863280.

The previous prime is 21203111313001. The next prime is 21203111313029. The reversal of 21203111313023 is 32031311130212.

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 21203111313023 - 2²⁴ = 21203094535807 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 21203111313023.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21203111313029) 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, 102927724718 + ... + 102927724923.

It is an arithmetic number, because the mean of its divisors is an integer number (5352241690692).

Almost surely, 2^{21203111313023} is an apocalyptic number.

21203111313023 is a deficient number, since it is larger than the sum of its proper divisors (205855449745).

21203111313023 is a wasteful number, since it uses less digits than its factorization.

21203111313023 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 205855449744.

The product of its (nonzero) digits is 648, while the sum is 23.

Adding to 21203111313023 its reverse (32031311130212), we get a palindrome (53234422443235).

The spelling of 21203111313023 in words is "twenty-one trillion, two hundred three billion, one hundred eleven million, three hundred thirteen thousand, twenty-three".