4221537 has 16 divisors (see below), whose sum is σ = 5785920. Its totient is φ = 2737152.

The previous prime is 4221533. The next prime is 4221541. The reversal of 4221537 is 7351224.

It is an interprime number because it is at equal distance from previous prime (4221533) and next prime (4221541).

It is not a de Polignac number, because 4221537 - 2² = 4221533 is a prime.

4221537 is a lucky number.

It is a congruent 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 in 15 ways as a sum of consecutive naturals, for example, 25818 + ... + 25980.

It is an arithmetic number, because the mean of its divisors is an integer number (361620).

Almost surely, 2^4221537 is an apocalyptic number.

It is an amenable number.

4221537 is a deficient number, since it is larger than the sum of its proper divisors (1564383).

4221537 is a wasteful number, since it uses less digits than its factorization.

4221537 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 352.

The product of its digits is 1680, while the sum is 24.

The square root of 4221537 is about 2054.6379243069. The cubic root of 4221537 is about 161.6181756057.

The spelling of 4221537 in words is "four million, two hundred twenty-one thousand, five hundred thirty-seven".