21054066 has 16 divisors (see below), whose sum is σ = 45936288. Its totient is φ = 6380000.

The previous prime is 21054049. The next prime is 21054067. The reversal of 21054066 is 66045012.

It is not an unprimeable number, because it can be changed into a prime (21054067) 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, 159435 + ... + 159566.

It is an arithmetic number, because the mean of its divisors is an integer number (2871018).

Almost surely, 2^21054066 is an apocalyptic number.

21054066 is an abundant number, since it is smaller than the sum of its proper divisors (24882222).

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

21054066 is a wasteful number, since it uses less digits than its factorization.

21054066 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 319017.

The product of its (nonzero) digits is 1440, while the sum is 24.

The square root of 21054066 is about 4588.4709871590. The cubic root of 21054066 is about 276.1289829813.

Adding to 21054066 its reverse (66045012), we get a palindrome (87099078).

The spelling of 21054066 in words is "twenty-one million, fifty-four thousand, sixty-six".