210120002001 has 48 divisors (see below), whose sum is σ = 383642581504. Its totient is φ = 107837039232.

The previous prime is 210120001979. The next prime is 210120002033. The reversal of 210120002001 is 100200021012.

It is not a de Polignac number, because 210120002001 - 2⁵ = 210120001969 is a prime.

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

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (210120002401) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 3436681 + ... + 3497286.

Almost surely, 2^210120002001 is an apocalyptic number.

210120002001 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

210120002001 is a deficient number, since it is larger than the sum of its proper divisors (173522579503).

210120002001 is a wasteful number, since it uses less digits than its factorization.

210120002001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6934030 (or 6934027 counting only the distinct ones).

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

Adding to 210120002001 its reverse (100200021012), we get a palindrome (310320023013).

The spelling of 210120002001 in words is "two hundred ten billion, one hundred twenty million, two thousand, one".