42521419 has 2 divisors, whose sum is σ = 42521420. Its totient is φ = 42521418.

The previous prime is 42521389. The next prime is 42521443. The reversal of 42521419 is 91412524.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 42521419 - 2⁷ = 42521291 is a prime.

It is a super-2 number, since 2×42521419² = 3616142147547122, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (42521459) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21260709 + 21260710.

It is an arithmetic number, because the mean of its divisors is an integer number (21260710).

Almost surely, 2^42521419 is an apocalyptic number.

42521419 is a deficient number, since it is larger than the sum of its proper divisors (1).

42521419 is an equidigital number, since it uses as much as digits as its factorization.

42521419 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2880, while the sum is 28.

The square root of 42521419 is about 6520.8449605860. The cubic root of 42521419 is about 349.0352178317.

It can be divided in two parts, 4252 and 1419, that added together give a triangular number (5671 = T₁₀₆).

The spelling of 42521419 in words is "forty-two million, five hundred twenty-one thousand, four hundred nineteen".