21300031012123 has 2 divisors, whose sum is σ = 21300031012124. Its totient is φ = 21300031012122.

The previous prime is 21300031012031. The next prime is 21300031012151. The reversal of 21300031012123 is 32121013000312.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21300031012123 - 2²¹ = 21300028914971 is a prime.

It is a super-2 number, since 2×21300031012123² (a number of 27 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 21300031012123.

It is not a weakly prime, because it can be changed into another prime (21300031013123) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10650015506061 + 10650015506062.

It is an arithmetic number, because the mean of its divisors is an integer number (10650015506062).

Almost surely, 2^{21300031012123} is an apocalyptic number.

21300031012123 is a deficient number, since it is larger than the sum of its proper divisors (1).

21300031012123 is an equidigital number, since it uses as much as digits as its factorization.

21300031012123 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 216, while the sum is 19.

Adding to 21300031012123 its reverse (32121013000312), we get a palindrome (53421044012435).

The spelling of 21300031012123 in words is "twenty-one trillion, three hundred billion, thirty-one million, twelve thousand, one hundred twenty-three".