54972021 has 32 divisors (see below), whose sum is σ = 83543040. Its totient is φ = 31910400.

The previous prime is 54971981. The next prime is 54972059. The reversal of 54972021 is 12027945.

It is not a de Polignac number, because 54972021 - 2⁶ = 54971957 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 54972021.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (54972091) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 49015 + ... + 50123.

It is an arithmetic number, because the mean of its divisors is an integer number (2610720).

Almost surely, 2^54972021 is an apocalyptic number.

It is an amenable number.

54972021 is a deficient number, since it is larger than the sum of its proper divisors (28571019).

54972021 is a wasteful number, since it uses less digits than its factorization.

54972021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1197.

The product of its (nonzero) digits is 5040, while the sum is 30.

The square root of 54972021 is about 7414.3119033394. The cubic root of 54972021 is about 380.2307485884.

Adding to 54972021 its reverse (12027945), we get a palindrome (66999966).

The spelling of 54972021 in words is "fifty-four million, nine hundred seventy-two thousand, twenty-one".