21210200220001 has 4 divisors (see below), whose sum is σ = 22841754083092. Its totient is φ = 19578646356912.

The previous prime is 21210200219959. The next prime is 21210200220017. The reversal of 21210200220001 is 10002200201212.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 1982326018401 + 19227874201600 = 1407951^2 + 4384960^2 .

It is a cyclic number.

It is not a de Polignac number, because 21210200220001 - 2¹¹ = 21210200217953 is a prime.

It is a super-3 number, since 3×21210200220001³ (a number of 41 digits) contains 333 as substring.

It is a Harshad number since it is a multiple of its sum of digits (13), and also a Moran number because the ratio is a prime number: 1631553863077 = 21210200220001 / (2 + 1 + 2 + 1 + 0 + 2 + 0 + 0 + 2 + 2 + 0 + 0 + 0 + 1).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21210200220061) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 815776931526 + ... + 815776931551.

It is an arithmetic number, because the mean of its divisors is an integer number (5710438520773).

Almost surely, 2^{21210200220001} is an apocalyptic number.

It is an amenable number.

21210200220001 is a deficient number, since it is larger than the sum of its proper divisors (1631553863091).

21210200220001 is a wasteful number, since it uses less digits than its factorization.

21210200220001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1631553863090.

The product of its (nonzero) digits is 32, while the sum is 13.

Adding to 21210200220001 its reverse (10002200201212), we get a palindrome (31212400421213).

The spelling of 21210200220001 in words is "twenty-one trillion, two hundred ten billion, two hundred million, two hundred twenty thousand, one".