21066102 has 16 divisors (see below), whose sum is σ = 46813680. Its totient is φ = 7022016.

The previous prime is 21066049. The next prime is 21066107. The reversal of 21066102 is 20166012.

It is a happy number.

21066102 is a `hidden beast` number, since 2 + 1 + 0 + 661 + 0 + 2 = 666.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21066107) 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, 195003 + ... + 195110.

It is an arithmetic number, because the mean of its divisors is an integer number (2925855).

Almost surely, 2^21066102 is an apocalyptic number.

21066102 is an abundant number, since it is smaller than the sum of its proper divisors (25747578).

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

21066102 is a wasteful number, since it uses less digits than its factorization.

21066102 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 390124 (or 390118 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 18.

The square root of 21066102 is about 4589.7823477808. The cubic root of 21066102 is about 276.1815912728.

The spelling of 21066102 in words is "twenty-one million, sixty-six thousand, one hundred two".