54221021 has 4 divisors (see below), whose sum is σ = 55686492. Its totient is φ = 52755552.

The previous prime is 54220997. The next prime is 54221029. The reversal of 54221021 is 12012245.

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

It can be written as a sum of positive squares in 2 ways, for example, as 39513796 + 14707225 = 6286^2 + 3835^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-54221021 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (54221029) 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, 732680 + ... + 732753.

It is an arithmetic number, because the mean of its divisors is an integer number (13921623).

Almost surely, 2^54221021 is an apocalyptic number.

It is an amenable number.

54221021 is a deficient number, since it is larger than the sum of its proper divisors (1465471).

54221021 is a wasteful number, since it uses less digits than its factorization.

54221021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1465470.

The product of its (nonzero) digits is 160, while the sum is 17.

The square root of 54221021 is about 7363.4924458439. The cubic root of 54221021 is about 378.4912963557.

Adding to 54221021 its reverse (12012245), we get a palindrome (66233266).

The spelling of 54221021 in words is "fifty-four million, two hundred twenty-one thousand, twenty-one".