210021321320201 has 16 divisors (see below), whose sum is σ = 217923621446160. Its totient is φ = 202236227297280.

The previous prime is 210021321320191. The next prime is 210021321320287. The reversal of 210021321320201 is 102023123120012.

It can be written as a sum of positive squares in 8 ways, for example, as 1228184815225 + 208793136504976 = 1108235^2 + 14449676^2 .

It is a cyclic number.

It is not a de Polignac number, because 210021321320201 - 2⁶ = 210021321320137 is a prime.

It is a super-2 number, since 2×210021321320201² (a number of 29 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (210021321520201) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 401954561 + ... + 402476721.

It is an arithmetic number, because the mean of its divisors is an integer number (13620226340385).

Almost surely, 2^{210021321320201} is an apocalyptic number.

It is an amenable number.

210021321320201 is a deficient number, since it is larger than the sum of its proper divisors (7902300125959).

210021321320201 is a wasteful number, since it uses less digits than its factorization.

210021321320201 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 634364.

The product of its (nonzero) digits is 288, while the sum is 20.

Adding to 210021321320201 its reverse (102023123120012), we get a palindrome (312044444440213).

The spelling of 210021321320201 in words is "two hundred ten trillion, twenty-one billion, three hundred twenty-one million, three hundred twenty thousand, two hundred one".