21003210003 has 8 divisors (see below), whose sum is σ = 28049670288. Its totient is φ = 13979444864.

The previous prime is 21003209977. The next prime is 21003210029. The reversal of 21003210003 is 30001230012.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (21003209977) and next prime (21003210029).

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

It is a cyclic number.

It is not a de Polignac number, because 21003210003 - 2¹⁶ = 21003144467 is a prime.

It is a super-2 number, since 2×21003210003² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (21003210073) 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, 5671626 + ... + 5675327.

It is an arithmetic number, because the mean of its divisors is an integer number (3506208786).

Almost surely, 2^21003210003 is an apocalyptic number.

21003210003 is a deficient number, since it is larger than the sum of its proper divisors (7046460285).

21003210003 is a wasteful number, since it uses less digits than its factorization.

21003210003 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11347573.

The product of its (nonzero) digits is 36, while the sum is 12.

Adding to 21003210003 its reverse (30001230012), we get a palindrome (51004440015).

The spelling of 21003210003 in words is "twenty-one billion, three million, two hundred ten thousand, three".