21003101 has 8 divisors (see below), whose sum is σ = 24224640. Its totient is φ = 17836848.

The previous prime is 21003097. The next prime is 21003107. The reversal of 21003101 is 10130012.

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 21003101 - 2² = 21003097 is a prime.

It is a super-2 number, since 2×21003101² = 882260503232402, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21003107) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 13001 + ... + 14526.

It is an arithmetic number, because the mean of its divisors is an integer number (3028080).

Almost surely, 2^21003101 is an apocalyptic number.

It is an amenable number.

21003101 is a deficient number, since it is larger than the sum of its proper divisors (3221539).

21003101 is a wasteful number, since it uses less digits than its factorization.

21003101 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27643.

The product of its (nonzero) digits is 6, while the sum is 8.

The square root of 21003101 is about 4582.9140293049. The cubic root of 21003101 is about 275.9059970076.

Adding to 21003101 its reverse (10130012), we get a palindrome (31133113).

The spelling of 21003101 in words is "twenty-one million, three thousand, one hundred one".