21010010001 has 8 divisors (see below), whose sum is σ = 28290706944. Its totient is φ = 13867993200.

The previous prime is 21010009991. The next prime is 21010010011. The reversal of 21010010001 is 10001001012.

It is an interprime number because it is at equal distance from previous prime (21010009991) and next prime (21010010011).

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

It is not a de Polignac number, because 21010010001 - 2⁷ = 21010009873 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21010010011) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 34669681 + ... + 34670286.

It is an arithmetic number, because the mean of its divisors is an integer number (3536338368).

Almost surely, 2^21010010001 is an apocalyptic number.

It is an amenable number.

21010010001 is a deficient number, since it is larger than the sum of its proper divisors (7280696943).

21010010001 is a wasteful number, since it uses less digits than its factorization.

21010010001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 69340071.

The product of its (nonzero) digits is 2, while the sum is 6.

Adding to 21010010001 its reverse (10001001012), we get a palindrome (31011011013).

The spelling of 21010010001 in words is "twenty-one billion, ten million, ten thousand, one".