21123201031323 has 16 divisors (see below), whose sum is σ = 28176759346176. Its totient is φ = 14075889200640.

The previous prime is 21123201031223. The next prime is 21123201031391. The reversal of 21123201031323 is 32313010232112.

It is not a de Polignac number, because 21123201031323 - 2¹⁰ = 21123201030299 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21123201031293 and 21123201031302.

It is not an unprimeable number, because it can be changed into a prime (21123201031223) 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, 109971738 + ... + 110163648.

It is an arithmetic number, because the mean of its divisors is an integer number (1761047459136).

Almost surely, 2^{21123201031323} is an apocalyptic number.

21123201031323 is a deficient number, since it is larger than the sum of its proper divisors (7053558314853).

21123201031323 is a wasteful number, since it uses less digits than its factorization.

21123201031323 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 207994.

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

Adding to 21123201031323 its reverse (32313010232112), we get a palindrome (53436211263435).

The spelling of 21123201031323 in words is "twenty-one trillion, one hundred twenty-three billion, two hundred one million, thirty-one thousand, three hundred twenty-three".