21873054 has 16 divisors (see below), whose sum is σ = 49995648. Its totient is φ = 6249432.

The previous prime is 21873053. The next prime is 21873077. The reversal of 21873054 is 45037812.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21873053) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 260352 + ... + 260435.

It is an arithmetic number, because the mean of its divisors is an integer number (3124728).

Almost surely, 2^21873054 is an apocalyptic number.

21873054 is an abundant number, since it is smaller than the sum of its proper divisors (28122594).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21873054 is a wasteful number, since it uses less digits than its factorization.

21873054 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 520799.

The product of its (nonzero) digits is 6720, while the sum is 30.

The square root of 21873054 is about 4676.8636926898. The cubic root of 21873054 is about 279.6639420604.

The spelling of 21873054 in words is "twenty-one million, eight hundred seventy-three thousand, fifty-four".