4221538 has 4 divisors (see below), whose sum is σ = 6332310. Its totient is φ = 2110768.

The previous prime is 4221533. The next prime is 4221541. The reversal of 4221538 is 8351224.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 4190209 + 31329 = 2047^2 + 177^2 .

It is an Ulam number.

It is not an unprimeable number, because it can be changed into a prime (4221533) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1055383 + ... + 1055386.

Almost surely, 2^4221538 is an apocalyptic number.

4221538 is a deficient number, since it is larger than the sum of its proper divisors (2110772).

4221538 is a wasteful number, since it uses less digits than its factorization.

4221538 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2110771.

The product of its digits is 1920, while the sum is 25.

The square root of 4221538 is about 2054.6381676587. The cubic root of 4221538 is about 161.6181883671.

The spelling of 4221538 in words is "four million, two hundred twenty-one thousand, five hundred thirty-eight".