54900021 has 16 divisors (see below), whose sum is σ = 84552768. Its totient is φ = 31315200.

The previous prime is 54900017. The next prime is 54900037. The reversal of 54900021 is 12000945.

It is not a de Polignac number, because 54900021 - 2² = 54900017 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (54900221) 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, 48370 + ... + 49491.

It is an arithmetic number, because the mean of its divisors is an integer number (5284548).

Almost surely, 2^54900021 is an apocalyptic number.

54900021 is a gapful number since it is divisible by the number (51) formed by its first and last digit.

It is an amenable number.

54900021 is a deficient number, since it is larger than the sum of its proper divisors (29652747).

54900021 is a wasteful number, since it uses less digits than its factorization.

54900021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 97892.

The product of its (nonzero) digits is 360, while the sum is 21.

The square root of 54900021 is about 7409.4548382455. The cubic root of 54900021 is about 380.0646727415.

Adding to 54900021 its reverse (12000945), we get a palindrome (66900966).

The spelling of 54900021 in words is "fifty-four million, nine hundred thousand, twenty-one".