21435066 has 12 divisors (see below), whose sum is σ = 46442682. Its totient is φ = 7145016.

The previous prime is 21435061. The next prime is 21435077. The reversal of 21435066 is 66053412.

It can be written as a sum of positive squares in only one way, i.e., 16573041 + 4862025 = 4071^2 + 2205^2 .

It is not an unprimeable number, because it can be changed into a prime (21435061) 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, 595401 + ... + 595436.

Almost surely, 2^21435066 is an apocalyptic number.

21435066 is an abundant number, since it is smaller than the sum of its proper divisors (25007616).

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

21435066 is a wasteful number, since it uses less digits than its factorization.

21435066 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1190845 (or 1190842 counting only the distinct ones).

The product of its (nonzero) digits is 4320, while the sum is 27.

The square root of 21435066 is about 4629.8019396082. The cubic root of 21435066 is about 277.7846701342.

Adding to 21435066 its reverse (66053412), we get a palindrome (87488478).

The spelling of 21435066 in words is "twenty-one million, four hundred thirty-five thousand, sixty-six".