42421515 has 16 divisors (see below), whose sum is σ = 68548896. Its totient is φ = 22400000.

The previous prime is 42421493. The next prime is 42421553. The reversal of 42421515 is 51512424.

It is not a de Polignac number, because 42421515 - 2⁹ = 42421003 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 12486 + ... + 15515.

It is an arithmetic number, because the mean of its divisors is an integer number (4284306).

Almost surely, 2^42421515 is an apocalyptic number.

42421515 is a deficient number, since it is larger than the sum of its proper divisors (26127381).

42421515 is a wasteful number, since it uses less digits than its factorization.

42421515 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28110.

The product of its digits is 1600, while the sum is 24.

The square root of 42421515 is about 6513.1800988457. The cubic root of 42421515 is about 348.7616509256.

Adding to 42421515 its reverse (51512424), we get a palindrome (93933939).

Subtracting 42421515 from its reverse (51512424), we obtain a palindrome (9090909).

The spelling of 42421515 in words is "forty-two million, four hundred twenty-one thousand, five hundred fifteen".