21133343011423 has 4 divisors (see below), whose sum is σ = 21159401388328. Its totient is φ = 21107284634520.

The previous prime is 21133343011373. The next prime is 21133343011481. The reversal of 21133343011423 is 32411034333112.

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 21133343011423 - 2²⁵ = 21133309456991 is a prime.

It is a super-2 number, since 2×21133343011423² (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 (21133343111423) 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, 13029187236 + ... + 13029188857.

It is an arithmetic number, because the mean of its divisors is an integer number (5289850347082).

Almost surely, 2^{21133343011423} is an apocalyptic number.

21133343011423 is a deficient number, since it is larger than the sum of its proper divisors (26058376905).

21133343011423 is an equidigital number, since it uses as much as digits as its factorization.

21133343011423 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26058376904.

The product of its (nonzero) digits is 15552, while the sum is 31.

Adding to 21133343011423 its reverse (32411034333112), we get a palindrome (53544377344535).

The spelling of 21133343011423 in words is "twenty-one trillion, one hundred thirty-three billion, three hundred forty-three million, eleven thousand, four hundred twenty-three".