21066762 has 8 divisors (see below), whose sum is σ = 42133536. Its totient is φ = 7022252.

The previous prime is 21066739. The next prime is 21066769. The reversal of 21066762 is 26766012.

It is a sphenic number, since it is the product of 3 distinct primes.

21066762 is an admirable number.

It is a super-2 number, since 2×21066762² = 887616922329288, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (21066769) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1755558 + ... + 1755569.

It is an arithmetic number, because the mean of its divisors is an integer number (5266692).

Almost surely, 2^21066762 is an apocalyptic number.

21066762 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

21066762 is a wasteful number, since it uses less digits than its factorization.

21066762 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3511132.

The product of its (nonzero) digits is 6048, while the sum is 30.

The square root of 21066762 is about 4589.8542460518. The cubic root of 21066762 is about 276.1844754948.

The spelling of 21066762 in words is "twenty-one million, sixty-six thousand, seven hundred sixty-two".