21579054 has 32 divisors (see below), whose sum is σ = 49821696. Its totient is φ = 6103200.

The previous prime is 21579053. The next prime is 21579059. The reversal of 21579054 is 45097512.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21579053) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1699 + ... + 6785.

It is an arithmetic number, because the mean of its divisors is an integer number (1556928).

Almost surely, 2^21579054 is an apocalyptic number.

21579054 is an abundant number, since it is smaller than the sum of its proper divisors (28242642).

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

21579054 is a wasteful number, since it uses less digits than its factorization.

21579054 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5200.

The product of its (nonzero) digits is 12600, while the sum is 33.

The square root of 21579054 is about 4645.3260380731. The cubic root of 21579054 is about 278.4052798658.

It can be divided in two parts, 2157 and 9054, that added together give a palindrome (11211).

The spelling of 21579054 in words is "twenty-one million, five hundred seventy-nine thousand, fifty-four".