10421321123 has 4 divisors (see below), whose sum is σ = 10421544000. Its totient is φ = 10421098248.

The previous prime is 10421321117. The next prime is 10421321143. The reversal of 10421321123 is 32112312401.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 10421321123 - 2⁴ = 10421321107 is a prime.

It is a super-2 number, since 2×10421321123² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 10421321095 and 10421321104.

It is not an unprimeable number, because it can be changed into a prime (10421321143) 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, 11315 + ... + 144812.

It is an arithmetic number, because the mean of its divisors is an integer number (2605386000).

Almost surely, 2^10421321123 is an apocalyptic number.

10421321123 is a deficient number, since it is larger than the sum of its proper divisors (222877).

10421321123 is an equidigital number, since it uses as much as digits as its factorization.

10421321123 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 222876.

The product of its (nonzero) digits is 288, while the sum is 20.

Adding to 10421321123 its reverse (32112312401), we get a palindrome (42533633524).

The spelling of 10421321123 in words is "ten billion, four hundred twenty-one million, three hundred twenty-one thousand, one hundred twenty-three".