42121742 has 32 divisors (see below), whose sum is σ = 69854400. Its totient is φ = 18931968.

The previous prime is 42121741. The next prime is 42121787. The reversal of 42121742 is 24712124.

It is a super-2 number, since 2×42121742² = 3548482298229128, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (42121741) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 252143 + ... + 252309.

It is an arithmetic number, because the mean of its divisors is an integer number (2182950).

Almost surely, 2^42121742 is an apocalyptic number.

42121742 is a deficient number, since it is larger than the sum of its proper divisors (27732658).

42121742 is a wasteful number, since it uses less digits than its factorization.

42121742 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 380.

The product of its digits is 896, while the sum is 23.

The square root of 42121742 is about 6490.1265010784. The cubic root of 42121742 is about 347.9381964055.

Adding to 42121742 its reverse (24712124), we get a palindrome (66833866).

The spelling of 42121742 in words is "forty-two million, one hundred twenty-one thousand, seven hundred forty-two".