210801121 has 4 divisors (see below), whose sum is σ = 210942144. Its totient is φ = 210660100.

The previous prime is 210801091. The next prime is 210801127. The reversal of 210801121 is 121108012.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 210801121 - 2⁵ = 210801089 is a prime.

It is a super-2 number, since 2×210801121² = 88874225229713282, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 210801095 and 210801104.

It is not an unprimeable number, because it can be changed into a prime (210801127) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 68245 + ... + 71266.

It is an arithmetic number, because the mean of its divisors is an integer number (52735536).

Almost surely, 2^210801121 is an apocalyptic number.

It is an amenable number.

210801121 is a deficient number, since it is larger than the sum of its proper divisors (141023).

210801121 is a wasteful number, since it uses less digits than its factorization.

210801121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 141022.

The product of its (nonzero) digits is 32, while the sum is 16.

The square root of 210801121 is about 14518.9917349656. The cubic root of 210801121 is about 595.1470775454.

Adding to 210801121 its reverse (121108012), we get a palindrome (331909133).

It can be divided in two parts, 21080 and 1121, that added together give a square (22201 = 149²).

The spelling of 210801121 in words is "two hundred ten million, eight hundred one thousand, one hundred twenty-one".