12400042021 has 8 divisors (see below), whose sum is σ = 12636673920. Its totient is φ = 12163509072.

The previous prime is 12400041931. The next prime is 12400042069. The reversal of 12400042021 is 12024000421.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 12400042021 - 2³³ = 3810107429 is a prime.

It is a super-2 number, since 2×12400042021² (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 = 12400041986 and 12400042004.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12400043021) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 259000 + ... + 303118.

It is an arithmetic number, because the mean of its divisors is an integer number (1579584240).

Almost surely, 2^12400042021 is an apocalyptic number.

It is an amenable number.

12400042021 is a deficient number, since it is larger than the sum of its proper divisors (236631899).

12400042021 is an equidigital number, since it uses as much as digits as its factorization.

12400042021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 49475.

The product of its (nonzero) digits is 128, while the sum is 16.

Adding to 12400042021 its reverse (12024000421), we get a palindrome (24424042442).

The spelling of 12400042021 in words is "twelve billion, four hundred million, forty-two thousand, twenty-one".