210021201 has 24 divisors (see below), whose sum is σ = 336924960. Its totient is φ = 129241008.

The previous prime is 210021191. The next prime is 210021209. The reversal of 210021201 is 102120012.

It is not a de Polignac number, because 210021201 - 2⁵ = 210021169 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 (210021209) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 18451 + ... + 27576.

It is an arithmetic number, because the mean of its divisors is an integer number (14038540).

Almost surely, 2^210021201 is an apocalyptic number.

It is an amenable number.

210021201 is a deficient number, since it is larger than the sum of its proper divisors (126903759).

210021201 is a wasteful number, since it uses less digits than its factorization.

210021201 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 46062 (or 46043 counting only the distinct ones).

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

The square root of 210021201 is about 14492.1082317239. The cubic root of 210021201 is about 594.4121973158.

Adding to 210021201 its reverse (102120012), we get a palindrome (312141213).

The spelling of 210021201 in words is "two hundred ten million, twenty-one thousand, two hundred one".