21471066 has 12 divisors (see below), whose sum is σ = 46520682. Its totient is φ = 7157016.

The previous prime is 21471041. The next prime is 21471067. The reversal of 21471066 is 66017412.

It can be written as a sum of positive squares in only one way, i.e., 14861025 + 6610041 = 3855^2 + 2571^2 .

It is a super-2 number, since 2×21471066² = 922013350352712, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (21471067) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 596401 + ... + 596436.

Almost surely, 2^21471066 is an apocalyptic number.

21471066 is an abundant number, since it is smaller than the sum of its proper divisors (25049616).

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

21471066 is a wasteful number, since it uses less digits than its factorization.

21471066 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1192845 (or 1192842 counting only the distinct ones).

The product of its (nonzero) digits is 2016, while the sum is 27.

The square root of 21471066 is about 4633.6881638712. The cubic root of 21471066 is about 277.9400954374.

Adding to 21471066 its reverse (66017412), we get a palindrome (87488478).

The spelling of 21471066 in words is "twenty-one million, four hundred seventy-one thousand, sixty-six".