21200010012001 has 4 divisors (see below), whose sum is σ = 21200020070404. Its totient is φ = 21199999953600.

The previous prime is 21200010011963. The next prime is 21200010012031. The reversal of 21200010012001 is 10021001000212.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 7544915733601 + 13655094278400 = 2746801^2 + 3695280^2 .

It is a cyclic number.

It is not a de Polignac number, because 21200010012001 - 2¹¹ = 21200010009953 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21200010012031) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 520020 + ... + 6532261.

It is an arithmetic number, because the mean of its divisors is an integer number (5300005017601).

Almost surely, 2^{21200010012001} is an apocalyptic number.

It is an amenable number.

21200010012001 is a deficient number, since it is larger than the sum of its proper divisors (10058403).

21200010012001 is an equidigital number, since it uses as much as digits as its factorization.

21200010012001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10058402.

The product of its (nonzero) digits is 8, while the sum is 10.

Adding to 21200010012001 its reverse (10021001000212), we get a palindrome (31221011012213).

The spelling of 21200010012001 in words is "twenty-one trillion, two hundred billion, ten million, twelve thousand, one".