210011121 has 12 divisors (see below), whose sum is σ = 303479748. Its totient is φ = 139947264.

The previous prime is 210011119. The next prime is 210011167. The reversal of 210011121 is 121110012.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 48441600 + 161569521 = 6960^2 + 12711^2 .

It is not a de Polignac number, because 210011121 - 2¹ = 210011119 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 (210011171) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 29881 + ... + 36233.

It is an arithmetic number, because the mean of its divisors is an integer number (25289979).

Almost surely, 2^210011121 is an apocalyptic number.

It is an amenable number.

210011121 is a deficient number, since it is larger than the sum of its proper divisors (93468627).

210011121 is a wasteful number, since it uses less digits than its factorization.

210011121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10032 (or 10029 counting only the distinct ones).

The product of its (nonzero) digits is 4, while the sum is 9.

The square root of 210011121 is about 14491.7604520638. The cubic root of 210011121 is about 594.4026875286.

Adding to 210011121 its reverse (121110012), we get a palindrome (331121133).

It can be divided in two parts, 21001 and 1121, that added together give a palindrome (22122).

The spelling of 210011121 in words is "two hundred ten million, eleven thousand, one hundred twenty-one".