42401223421 has 32 divisors (see below), whose sum is σ = 46899645408. Its totient is φ = 38170460160.

The previous prime is 42401223367. The next prime is 42401223451. The reversal of 42401223421 is 12432210424.

It can be written as a sum of positive squares in 16 ways, for example, as 9473128900 + 32928094521 = 97330^2 + 181461^2 .

It is a cyclic number.

It is not a de Polignac number, because 42401223421 - 2²⁵ = 42367668989 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (42401223451) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 8800005 + ... + 8804821.

It is an arithmetic number, because the mean of its divisors is an integer number (1465613919).

Almost surely, 2^42401223421 is an apocalyptic number.

42401223421 is a gapful number since it is divisible by the number (41) formed by its first and last digit.

It is an amenable number.

42401223421 is a deficient number, since it is larger than the sum of its proper divisors (4498421987).

42401223421 is a wasteful number, since it uses less digits than its factorization.

42401223421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5121.

The product of its (nonzero) digits is 3072, while the sum is 25.

Adding to 42401223421 its reverse (12432210424), we get a palindrome (54833433845).

The spelling of 42401223421 in words is "forty-two billion, four hundred one million, two hundred twenty-three thousand, four hundred twenty-one".