54642221 has 4 divisors (see below), whose sum is σ = 55172832. Its totient is φ = 54111612.

The previous prime is 54642193. The next prime is 54642251. The reversal of 54642221 is 12224645.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-54642221 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (54642251) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 265151 + ... + 265356.

It is an arithmetic number, because the mean of its divisors is an integer number (13793208).

Almost surely, 2^54642221 is an apocalyptic number.

It is an amenable number.

54642221 is a deficient number, since it is larger than the sum of its proper divisors (530611).

54642221 is a wasteful number, since it uses less digits than its factorization.

54642221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 530610.

The product of its digits is 3840, while the sum is 26.

The square root of 54642221 is about 7392.0376757698. The cubic root of 54642221 is about 379.4688354457.

Adding to 54642221 its reverse (12224645), we get a palindrome (66866866).

The spelling of 54642221 in words is "fifty-four million, six hundred forty-two thousand, two hundred twenty-one".