216140121 has 12 divisors (see below), whose sum is σ = 313822548. Its totient is φ = 143345664.

The previous prime is 216140087. The next prime is 216140123. The reversal of 216140121 is 121041612.

It can be written as a sum of positive squares in 2 ways, for example, as 148571721 + 67568400 = 12189^2 + 8220^2 .

It is not a de Polignac number, because 216140121 - 2¹⁰ = 216139097 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 216140094 and 216140103.

It is not an unprimeable number, because it can be changed into a prime (216140123) 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, 60480 + ... + 63953.

It is an arithmetic number, because the mean of its divisors is an integer number (26151879).

Almost surely, 2^216140121 is an apocalyptic number.

It is an amenable number.

216140121 is a deficient number, since it is larger than the sum of its proper divisors (97682427).

216140121 is a wasteful number, since it uses less digits than its factorization.

216140121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 124632 (or 124629 counting only the distinct ones).

The product of its (nonzero) digits is 96, while the sum is 18.

The square root of 216140121 is about 14701.7046970751. The cubic root of 216140121 is about 600.1297136219.

Adding to 216140121 its reverse (121041612), we get a palindrome (337181733).

The spelling of 216140121 in words is "two hundred sixteen million, one hundred forty thousand, one hundred twenty-one".