21546342 has 36 divisors (see below), whose sum is σ = 49337340. Its totient is φ = 6777000.

The previous prime is 21546313. The next prime is 21546347. The reversal of 21546342 is 24364512.

21546342 is a `hidden beast` number, since 21 + 5 + 4 + 634 + 2 = 666.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21546347) 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 17 ways as a sum of consecutive naturals, for example, 85717 + ... + 85967.

Almost surely, 2^21546342 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21546342, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (24668670).

21546342 is an abundant number, since it is smaller than the sum of its proper divisors (27790998).

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

21546342 is a wasteful number, since it uses less digits than its factorization.

21546342 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 529 (or 275 counting only the distinct ones).

The product of its digits is 5760, while the sum is 27.

The square root of 21546342 is about 4641.8037442356. The cubic root of 21546342 is about 278.2645291900.

The spelling of 21546342 in words is "twenty-one million, five hundred forty-six thousand, three hundred forty-two".