21011030001 has 12 divisors (see below), whose sum is σ = 32683824628. Its totient is φ = 12929864544.

The previous prime is 21011029999. The next prime is 21011030003. The reversal of 21011030001 is 10003011012.

It is an interprime number because it is at equal distance from previous prime (21011029999) and next prime (21011030003).

It can be written as a sum of positive squares in 2 ways, for example, as 6327407025 + 14683622976 = 79545^2 + 121176^2 .

It is not a de Polignac number, because 21011030001 - 2¹ = 21011029999 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (9).

It is not an unprimeable number, because it can be changed into a prime (21011030003) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 89790610 + ... + 89790843.

Almost surely, 2^21011030001 is an apocalyptic number.

It is an amenable number.

21011030001 is a deficient number, since it is larger than the sum of its proper divisors (11672794627).

21011030001 is a wasteful number, since it uses less digits than its factorization.

21011030001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 179581472 (or 179581469 counting only the distinct ones).

The product of its (nonzero) digits is 6, while the sum is 9.

Adding to 21011030001 its reverse (10003011012), we get a palindrome (31014041013).

The spelling of 21011030001 in words is "twenty-one billion, eleven million, thirty thousand, one".