201001001000021 has 8 divisors (see below), whose sum is σ = 204774777548640. Its totient is φ = 197239457115568.

The previous prime is 201001001000011. The next prime is 201001001000147. The reversal of 201001001000021 is 120000100100102.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-201001001000021 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 201001000999972 and 201001001000008.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (201001001000011) 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, 3058132871 + ... + 3058198596.

It is an arithmetic number, because the mean of its divisors is an integer number (25596847193580).

Almost surely, 2^{201001001000021} is an apocalyptic number.

It is an amenable number.

201001001000021 is a deficient number, since it is larger than the sum of its proper divisors (3773776548619).

201001001000021 is an equidigital number, since it uses as much as digits as its factorization.

201001001000021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6116332083.

The product of its (nonzero) digits is 4, while the sum is 8.

Adding to 201001001000021 its reverse (120000100100102), we get a palindrome (321001101100123).

The spelling of 201001001000021 in words is "two hundred one trillion, one billion, one million, twenty-one", and thus it is an aban number.