210201000021 has 32 divisors (see below), whose sum is σ = 315811440000. Its totient is φ = 138161890944.

The previous prime is 210200999971. The next prime is 210201000049. The reversal of 210201000021 is 120000102012.

210201000021 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 210201000021 - 2⁷ = 210200999893 is a prime.

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

It is a junction number, because it is equal to n+sod(n) for n = 210200999967 and 210201000012.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (210201000071) 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 31 ways as a sum of consecutive naturals, for example, 713326 + ... + 963968.

It is an arithmetic number, because the mean of its divisors is an integer number (9869107500).

Almost surely, 2^210201000021 is an apocalyptic number.

It is an amenable number.

210201000021 is a deficient number, since it is larger than the sum of its proper divisors (105610439979).

210201000021 is a wasteful number, since it uses less digits than its factorization.

210201000021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 251090 (or 251084 counting only the distinct ones).

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

Adding to 210201000021 its reverse (120000102012), we get a palindrome (330201102033).

The spelling of 210201000021 in words is "two hundred ten billion, two hundred one million, twenty-one", and thus it is an aban number.