210221121 has 8 divisors (see below), whose sum is σ = 305776224. Its totient is φ = 127406720.

The previous prime is 210221119. The next prime is 210221153. The reversal of 210221121 is 121122012.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 210221121 - 2¹ = 210221119 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 210221097 and 210221106.

It is not an unprimeable number, because it can be changed into a prime (210221101) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3185136 + ... + 3185201.

It is an arithmetic number, because the mean of its divisors is an integer number (38222028).

Almost surely, 2^210221121 is an apocalyptic number.

It is an amenable number.

210221121 is a deficient number, since it is larger than the sum of its proper divisors (95555103).

210221121 is a wasteful number, since it uses less digits than its factorization.

210221121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6370351.

The product of its (nonzero) digits is 16, while the sum is 12.

The square root of 210221121 is about 14499.0041382158. The cubic root of 210221121 is about 594.6007452646.

Adding to 210221121 its reverse (121122012), we get a palindrome (331343133).

The spelling of 210221121 in words is "two hundred ten million, two hundred twenty-one thousand, one hundred twenty-one".