21546042 has 16 divisors (see below), whose sum is σ = 49248192. Its totient is φ = 6156000.

The previous prime is 21546029. The next prime is 21546047. The reversal of 21546042 is 24064512.

It is a super-3 number, since 3×21546042³ (a number of 23 digits) contains 333 as substring.

It is not an unprimeable number, because it can be changed into a prime (21546047) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 256459 + ... + 256542.

It is an arithmetic number, because the mean of its divisors is an integer number (3078012).

Almost surely, 2^21546042 is an apocalyptic number.

21546042 is an abundant number, since it is smaller than the sum of its proper divisors (27702150).

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

21546042 is a wasteful number, since it uses less digits than its factorization.

21546042 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 513013.

The product of its (nonzero) digits is 1920, while the sum is 24.

The square root of 21546042 is about 4641.7714290990. The cubic root of 21546042 is about 278.2632377141.

The spelling of 21546042 in words is "twenty-one million, five hundred forty-six thousand, forty-two".