21135066 has 16 divisors (see below), whose sum is σ = 43413024. Its totient is φ = 6854544.

The previous prime is 21135053. The next prime is 21135071. The reversal of 21135066 is 66053112.

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, 47380 + ... + 47823.

It is an arithmetic number, because the mean of its divisors is an integer number (2713314).

Almost surely, 2^21135066 is an apocalyptic number.

21135066 is an abundant number, since it is smaller than the sum of its proper divisors (22277958).

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

21135066 is a wasteful number, since it uses less digits than its factorization.

21135066 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 95245.

The product of its (nonzero) digits is 1080, while the sum is 24.

The square root of 21135066 is about 4597.2889837381. The cubic root of 21135066 is about 276.4826411259.

Adding to 21135066 its reverse (66053112), we get a palindrome (87188178).

The spelling of 21135066 in words is "twenty-one million, one hundred thirty-five thousand, sixty-six".