10001000021 has 8 divisors (see below), whose sum is σ = 10114004544. Its totient is φ = 9888197760.

The previous prime is 10001000017. The next prime is 10001000069. The reversal of 10001000021 is 12000010001.

It is a happy number.

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 10001000021 - 2² = 10001000017 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 10000999969 and 10001000014.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (10001000011) 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, 50006 + ... + 150008.

It is an arithmetic number, because the mean of its divisors is an integer number (1264250568).

Almost surely, 2^10001000021 is an apocalyptic number.

It is an amenable number.

10001000021 is a deficient number, since it is larger than the sum of its proper divisors (113004523).

10001000021 is a wasteful number, since it uses less digits than its factorization.

10001000021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 101131.

The product of its (nonzero) digits is 2, while the sum is 5.

Adding to 10001000021 its reverse (12000010001), we get a palindrome (22001010022).

The spelling of 10001000021 in words is "ten billion, one million, twenty-one", and thus it is an aban number and an uban number.