21064003 has 8 divisors (see below), whose sum is σ = 22682160. Its totient is φ = 19488000.

The previous prime is 21063997. The next prime is 21064009. The reversal of 21064003 is 30046012.

It is an interprime number because it is at equal distance from previous prime (21063997) and next prime (21064009).

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21064003 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21064009) 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, 9498 + ... + 11503.

It is an arithmetic number, because the mean of its divisors is an integer number (2835270).

Almost surely, 2^21064003 is an apocalyptic number.

21064003 is a deficient number, since it is larger than the sum of its proper divisors (1618157).

21064003 is a wasteful number, since it uses less digits than its factorization.

21064003 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21077.

The product of its (nonzero) digits is 144, while the sum is 16.

The square root of 21064003 is about 4589.5536820044. The cubic root of 21064003 is about 276.1724181723.

Subtracting 21064003 from its reverse (30046012), we obtain a square (8982009 = 2997²).

The spelling of 21064003 in words is "twenty-one million, sixty-four thousand, three".