123401102021 has 4 divisors (see below), whose sum is σ = 123402007872. Its totient is φ = 123400196172.

The previous prime is 123401101939. The next prime is 123401102023. The reversal of 123401102021 is 120201104321.

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: 120201104321 = 13183 ⋅9117887.

It is a cyclic number.

It is not a de Polignac number, because 123401102021 - 2²² = 123396907717 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 (123401102023) 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, 202391 + ... + 536436.

It is an arithmetic number, because the mean of its divisors is an integer number (30850501968).

Almost surely, 2^123401102021 is an apocalyptic number.

It is an amenable number.

123401102021 is a deficient number, since it is larger than the sum of its proper divisors (905851).

123401102021 is an equidigital number, since it uses as much as digits as its factorization.

123401102021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 905850.

The product of its (nonzero) digits is 96, while the sum is 17.

Adding to 123401102021 its reverse (120201104321), we get a palindrome (243602206342).

The spelling of 123401102021 in words is "one hundred twenty-three billion, four hundred one million, one hundred two thousand, twenty-one".