21151066 has 8 divisors (see below), whose sum is σ = 33396480. Its totient is φ = 10018908.

The previous prime is 21151061. The next prime is 21151069. The reversal of 21151066 is 66015112.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a zygodrome in base 4.

It is not an unprimeable number, because it can be changed into a prime (21151061) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 278266 + ... + 278341.

It is an arithmetic number, because the mean of its divisors is an integer number (4174560).

Almost surely, 2^21151066 is an apocalyptic number.

21151066 is a deficient number, since it is larger than the sum of its proper divisors (12245414).

21151066 is a wasteful number, since it uses less digits than its factorization.

21151066 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 556628.

The product of its (nonzero) digits is 360, while the sum is 22.

The square root of 21151066 is about 4599.0288105208. The cubic root of 21151066 is about 276.5523926062.

Adding to 21151066 its reverse (66015112), we get a palindrome (87166178).

It can be divided in two parts, 2115106 and 6, that added together give a palindrome (2115112).

The spelling of 21151066 in words is "twenty-one million, one hundred fifty-one thousand, sixty-six".