210221010 has 24 divisors (see below), whose sum is σ = 546574860. Its totient is φ = 56058912.

The previous prime is 210221003. The next prime is 210221027. The reversal of 210221010 is 10122012.

It can be written as a sum of positive squares in 2 ways, for example, as 210221001 + 9 = 14499^2 + 3^2 .

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 = 210220983 and 210221001.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1167805 + ... + 1167984.

Almost surely, 2^210221010 is an apocalyptic number.

210221010 is an abundant number, since it is smaller than the sum of its proper divisors (336353850).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

210221010 is a wasteful number, since it uses less digits than its factorization.

210221010 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2335802 (or 2335799 counting only the distinct ones).

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

The square root of 210221010 is about 14499.0003103662. Note that the first 3 decimals coincide. The cubic root of 210221010 is about 594.6006406118.

Adding to 210221010 its reverse (10122012), we get a palindrome (220343022).

The spelling of 210221010 in words is "two hundred ten million, two hundred twenty-one thousand, ten".