210021200001 has 20 divisors (see below), whose sum is σ = 313841829972. Its totient is φ = 139966623648.

The previous prime is 210021199981. The next prime is 210021200017. The reversal of 210021200001 is 100002120012.

It can be written as a sum of positive squares in 2 ways, for example, as 39332408976 + 170688791025 = 198324^2 + 413145^2 .

It is not a de Polignac number, because 210021200001 - 2¹⁹ = 210020675713 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (9).

It is not an unprimeable number, because it can be changed into a prime (210021200071) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 198910 + ... + 677943.

Almost surely, 2^210021200001 is an apocalyptic number.

It is an amenable number.

210021200001 is a deficient number, since it is larger than the sum of its proper divisors (103820629971).

210021200001 is an equidigital number, since it uses as much as digits as its factorization.

210021200001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 879822 (or 879813 counting only the distinct ones).

The product of its (nonzero) digits is 8, while the sum is 9.

Adding to 210021200001 its reverse (100002120012), we get a palindrome (310023320013).

The spelling of 210021200001 in words is "two hundred ten billion, twenty-one million, two hundred thousand, one".