21756002 has 8 divisors (see below), whose sum is σ = 32869200. Its totient is φ = 10799604.

The previous prime is 21755959. The next prime is 21756041. The reversal of 21756002 is 20065712.

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

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 38852 + ... + 39407.

It is an arithmetic number, because the mean of its divisors is an integer number (4108650).

Almost surely, 2^21756002 is an apocalyptic number.

21756002 is a deficient number, since it is larger than the sum of its proper divisors (11113198).

21756002 is a wasteful number, since it uses less digits than its factorization.

21756002 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 78400.

The product of its (nonzero) digits is 840, while the sum is 23.

The square root of 21756002 is about 4664.3329641011. The cubic root of 21756002 is about 279.1641826862.

The spelling of 21756002 in words is "twenty-one million, seven hundred fifty-six thousand, two".