21542946 has 16 divisors (see below), whose sum is σ = 43276800. Its totient is φ = 7149168.

The previous prime is 21542929. The next prime is 21542951. The reversal of 21542946 is 64924512.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6466 + ... + 9213.

It is an arithmetic number, because the mean of its divisors is an integer number (2704800).

Almost surely, 2^21542946 is an apocalyptic number.

21542946 is an abundant number, since it is smaller than the sum of its proper divisors (21733854).

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

21542946 is a wasteful number, since it uses less digits than its factorization.

21542946 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15913.

The product of its digits is 17280, while the sum is 33.

The square root of 21542946 is about 4641.4379237473. The cubic root of 21542946 is about 278.2499089822.

The spelling of 21542946 in words is "twenty-one million, five hundred forty-two thousand, nine hundred forty-six".