42123403321 has 12 divisors (see below), whose sum is σ = 44690107644. Its totient is φ = 39678867200.

The previous prime is 42123403249. The next prime is 42123403349. The reversal of 42123403321 is 12330432124.

It can be written as a sum of positive squares in 6 ways, for example, as 13371453225 + 28751950096 = 115635^2 + 169564^2 .

It is not a de Polignac number, because 42123403321 - 2⁷ = 42123403193 is a prime.

It is a super-2 number, since 2×42123403321² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (42123403391) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 576340 + ... + 645301.

It is an arithmetic number, because the mean of its divisors is an integer number (3724175637).

Almost surely, 2^42123403321 is an apocalyptic number.

42123403321 is a gapful number since it is divisible by the number (41) formed by its first and last digit.

It is an amenable number.

42123403321 is a deficient number, since it is larger than the sum of its proper divisors (2566704323).

42123403321 is a wasteful number, since it uses less digits than its factorization.

42123403321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1221740 (or 1221711 counting only the distinct ones).

The product of its (nonzero) digits is 3456, while the sum is 25.

Adding to 42123403321 its reverse (12330432124), we get a palindrome (54453835445).

The spelling of 42123403321 in words is "forty-two billion, one hundred twenty-three million, four hundred three thousand, three hundred twenty-one".