42022421 has 16 divisors (see below), whose sum is σ = 50077440. Its totient is φ = 34500480.

The previous prime is 42022399. The next prime is 42022423. The reversal of 42022421 is 12422024.

It is a happy number.

It is not a de Polignac number, because 42022421 - 2¹⁴ = 42006037 is a prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 42022421.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (42022423) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 27056 + ... + 28566.

It is an arithmetic number, because the mean of its divisors is an integer number (3129840).

Almost surely, 2^42022421 is an apocalyptic number.

It is an amenable number.

42022421 is a deficient number, since it is larger than the sum of its proper divisors (8055019).

42022421 is a wasteful number, since it uses less digits than its factorization.

42022421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1684.

The product of its (nonzero) digits is 256, while the sum is 17.

The square root of 42022421 is about 6482.4702853156. The cubic root of 42022421 is about 347.6645074484.

Adding to 42022421 its reverse (12422024), we get a palindrome (54444445).

The spelling of 42022421 in words is "forty-two million, twenty-two thousand, four hundred twenty-one".