21003332001 has 8 divisors (see below), whose sum is σ = 28005112320. Its totient is φ = 14001886512.

The previous prime is 21003331957. The next prime is 21003332017. The reversal of 21003332001 is 10023330012.

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

It is not a de Polignac number, because 21003332001 - 2¹⁹ = 21002807713 is a prime.

It is a super-2 number, since 2×21003332001² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (21003332081) 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, 200995 + ... + 287063.

It is an arithmetic number, because the mean of its divisors is an integer number (3500639040).

Almost surely, 2^21003332001 is an apocalyptic number.

It is an amenable number.

21003332001 is a deficient number, since it is larger than the sum of its proper divisors (7001780319).

21003332001 is an equidigital number, since it uses as much as digits as its factorization.

21003332001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 167415.

The product of its (nonzero) digits is 108, while the sum is 15.

Adding to 21003332001 its reverse (10023330012), we get a palindrome (31026662013).

The spelling of 21003332001 in words is "twenty-one billion, three million, three hundred thirty-two thousand, one".