21066612 has 24 divisors (see below), whose sum is σ = 56177856. Its totient is φ = 6019008.

The previous prime is 21066607. The next prime is 21066613. The reversal of 21066612 is 21666012.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21066613) 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, 125313 + ... + 125480.

It is an arithmetic number, because the mean of its divisors is an integer number (2340744).

Almost surely, 2^21066612 is an apocalyptic number.

It is an amenable number.

21066612 is an abundant number, since it is smaller than the sum of its proper divisors (35111244).

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

21066612 is a wasteful number, since it uses less digits than its factorization.

21066612 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 250807 (or 250805 counting only the distinct ones).

The product of its (nonzero) digits is 864, while the sum is 24.

The square root of 21066612 is about 4589.8379056346. The cubic root of 21066612 is about 276.1838199951.

The spelling of 21066612 in words is "twenty-one million, sixty-six thousand, six hundred twelve".