123421301130021 has 4 divisors (see below), whose sum is σ = 164561734840032. Its totient is φ = 82280867420012.

The previous prime is 123421301130007. The next prime is 123421301130053. The reversal of 123421301130021 is 120031103124321.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 123421301130021 - 2²⁹ = 123420764259109 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 123421301129973 and 123421301130000.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (123421311130021) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 20570216855001 + ... + 20570216855006.

It is an arithmetic number, because the mean of its divisors is an integer number (41140433710008).

Almost surely, 2^{123421301130021} is an apocalyptic number.

It is an amenable number.

123421301130021 is a deficient number, since it is larger than the sum of its proper divisors (41140433710011).

123421301130021 is an equidigital number, since it uses as much as digits as its factorization.

123421301130021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 41140433710010.

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

Adding to 123421301130021 its reverse (120031103124321), we get a palindrome (243452404254342).

The spelling of 123421301130021 in words is "one hundred twenty-three trillion, four hundred twenty-one billion, three hundred one million, one hundred thirty thousand, twenty-one".