21201022000001 has 6 divisors (see below), whose sum is σ = 21730732248006. Its totient is φ = 20683923900800.

The previous prime is 21201021999959. The next prime is 21201022000003. The reversal of 21201022000001 is 10000022010212.

It is a happy number.

It can be written as a sum of positive squares in 3 ways, for example, as 164672828401 + 21036349171600 = 405799^2 + 4586540^2 .

It is a de Polignac number, because none of the positive numbers 2^k-21201022000001 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21201022000003) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 6306072680 + ... + 6306076041.

It is an arithmetic number, because the mean of its divisors is an integer number (3621788708001).

Almost surely, 2^{21201022000001} is an apocalyptic number.

It is an amenable number.

21201022000001 is a deficient number, since it is larger than the sum of its proper divisors (529710248005).

21201022000001 is an equidigital number, since it uses as much as digits as its factorization.

21201022000001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12612148803 (or 12612148762 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 11.

Adding to 21201022000001 its reverse (10000022010212), we get a palindrome (31201044010213).

The spelling of 21201022000001 in words is "twenty-one trillion, two hundred one billion, twenty-two million, one", and thus it is an aban number.