42984421 has 2 divisors, whose sum is σ = 42984422. Its totient is φ = 42984420.

The previous prime is 42984413. The next prime is 42984427. The reversal of 42984421 is 12448924.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 30636225 + 12348196 = 5535^2 + 3514^2 .

It is a cyclic number.

It is not a de Polignac number, because 42984421 - 2³ = 42984413 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (42984427) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21492210 + 21492211.

It is an arithmetic number, because the mean of its divisors is an integer number (21492211).

Almost surely, 2^42984421 is an apocalyptic number.

It is an amenable number.

42984421 is a deficient number, since it is larger than the sum of its proper divisors (1).

42984421 is an equidigital number, since it uses as much as digits as its factorization.

42984421 is an evil number, because the sum of its binary digits is even.

The product of its digits is 18432, while the sum is 34.

The square root of 42984421 is about 6556.2505290753. The cubic root of 42984421 is about 350.2974912859.

The spelling of 42984421 in words is "forty-two million, nine hundred eighty-four thousand, four hundred twenty-one".