42121352421 has 24 divisors (see below), whose sum is σ = 64515372480. Its totient is φ = 26390322816.

The previous prime is 42121352401. The next prime is 42121352423. The reversal of 42121352421 is 12425312124.

42121352421 is a `hidden beast` number, since 4 + 21 + 213 + 5 + 2 + 421 = 666.

42121352421 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 42121352421 - 2¹⁷ = 42121221349 is a prime.

It is a super-2 number, since 2×42121352421² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (42121352423) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 97041 + ... + 306038.

It is an arithmetic number, because the mean of its divisors is an integer number (2688140520).

Almost surely, 2^42121352421 is an apocalyptic number.

It is an amenable number.

42121352421 is a deficient number, since it is larger than the sum of its proper divisors (22394020059).

42121352421 is a wasteful number, since it uses less digits than its factorization.

42121352421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 403785 (or 403782 counting only the distinct ones).

The product of its digits is 3840, while the sum is 27.

Adding to 42121352421 its reverse (12425312124), we get a palindrome (54546664545).

The spelling of 42121352421 in words is "forty-two billion, one hundred twenty-one million, three hundred fifty-two thousand, four hundred twenty-one".