123021412421 has 4 divisors (see below), whose sum is σ = 123022284672. Its totient is φ = 123020540172.

The previous prime is 123021412331. The next prime is 123021412433. The reversal of 123021412421 is 124214120321.

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, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 124214120321 = 23 ⋅5400613927.

It is a cyclic number.

It is not a de Polignac number, because 123021412421 - 2¹⁰ = 123021411397 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (123021412471) 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, 170735 + ... + 524588.

It is an arithmetic number, because the mean of its divisors is an integer number (30755571168).

Almost surely, 2^123021412421 is an apocalyptic number.

It is an amenable number.

123021412421 is a deficient number, since it is larger than the sum of its proper divisors (872251).

123021412421 is an equidigital number, since it uses as much as digits as its factorization.

123021412421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 872250.

The product of its (nonzero) digits is 768, while the sum is 23.

Adding to 123021412421 its reverse (124214120321), we get a palindrome (247235532742).

The spelling of 123021412421 in words is "one hundred twenty-three billion, twenty-one million, four hundred twelve thousand, four hundred twenty-one".