42021403421 has 8 divisors (see below), whose sum is σ = 42600309120. Its totient is φ = 41443672608.

The previous prime is 42021403381. The next prime is 42021403429. The reversal of 42021403421 is 12430412024.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-42021403421 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 (42021403429) 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, 221576 + ... + 364881.

It is an arithmetic number, because the mean of its divisors is an integer number (5325038640).

Almost surely, 2^42021403421 is an apocalyptic number.

It is an amenable number.

42021403421 is a deficient number, since it is larger than the sum of its proper divisors (578905699).

42021403421 is an equidigital number, since it uses as much as digits as its factorization.

42021403421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 587443.

The product of its (nonzero) digits is 1536, while the sum is 23.

Adding to 42021403421 its reverse (12430412024), we get a palindrome (54451815445).

The spelling of 42021403421 in words is "forty-two billion, twenty-one million, four hundred three thousand, four hundred twenty-one".