42144421 has 12 divisors (see below), whose sum is σ = 46496800. Its totient is φ = 38170440.

The previous prime is 42144409. The next prime is 42144457. The reversal of 42144421 is 12444124.

It is not a de Polignac number, because 42144421 - 2⁷ = 42144293 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 42144392 and 42144401.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (42144481) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 45400 + ... + 46318.

Almost surely, 2^42144421 is an apocalyptic number.

It is an amenable number.

42144421 is a deficient number, since it is larger than the sum of its proper divisors (4352379).

42144421 is a wasteful number, since it uses less digits than its factorization.

42144421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1320 (or 1309 counting only the distinct ones).

The product of its digits is 1024, while the sum is 22.

The square root of 42144421 is about 6491.8734584094. The cubic root of 42144421 is about 348.0006303111. Note that the first 3 decimals are identical.

Adding to 42144421 its reverse (12444124), we get a palindrome (54588545).

The spelling of 42144421 in words is "forty-two million, one hundred forty-four thousand, four hundred twenty-one".