21056002 has 8 divisors (see below), whose sum is σ = 34455312. Its totient is φ = 9570900.

The previous prime is 21055967. The next prime is 21056011. The reversal of 21056002 is 20065012.

It is a happy number.

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 (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 478524 + ... + 478567.

It is an arithmetic number, because the mean of its divisors is an integer number (4306914).

Almost surely, 2^21056002 is an apocalyptic number.

21056002 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

21056002 is a deficient number, since it is larger than the sum of its proper divisors (13399310).

21056002 is a wasteful number, since it uses less digits than its factorization.

21056002 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 957104.

The product of its (nonzero) digits is 120, while the sum is 16.

The square root of 21056002 is about 4588.6819458315. The cubic root of 21056002 is about 276.1374464189.

The spelling of 21056002 in words is "twenty-one million, fifty-six thousand, two".