21323120121123 has 4 divisors (see below), whose sum is σ = 28430826828168. Its totient is φ = 14215413414080.

The previous prime is 21323120121101. The next prime is 21323120121161. The reversal of 21323120121123 is 32112102132312.

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 21323120121123 - 2²⁴ = 21323103343907 is a prime.

It is a super-2 number, since 2×21323120121123² (a number of 27 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 21323120121093 and 21323120121102.

It is not an unprimeable number, because it can be changed into a prime (21323120125123) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3553853353518 + ... + 3553853353523.

It is an arithmetic number, because the mean of its divisors is an integer number (7107706707042).

Almost surely, 2^{21323120121123} is an apocalyptic number.

21323120121123 is a deficient number, since it is larger than the sum of its proper divisors (7107706707045).

21323120121123 is an equidigital number, since it uses as much as digits as its factorization.

21323120121123 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7107706707044.

The product of its (nonzero) digits is 864, while the sum is 24.

Adding to 21323120121123 its reverse (32112102132312), we get a palindrome (53435222253435).

The spelling of 21323120121123 in words is "twenty-one trillion, three hundred twenty-three billion, one hundred twenty million, one hundred twenty-one thousand, one hundred twenty-three".