209121141 has 8 divisors (see below), whose sum is σ = 278994784. Its totient is φ = 139330800.

The previous prime is 209121127. The next prime is 209121161. The reversal of 209121141 is 141121902.

It is a happy number.

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

It is a de Polignac number, because none of the positive numbers 2^k-209121141 is a prime.

It is a super-2 number, since 2×209121141² = 87463303226283762, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (209121161) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 14710 + ... + 25191.

It is an arithmetic number, because the mean of its divisors is an integer number (34874348).

Almost surely, 2^209121141 is an apocalyptic number.

It is an amenable number.

209121141 is a deficient number, since it is larger than the sum of its proper divisors (69873643).

209121141 is a wasteful number, since it uses less digits than its factorization.

209121141 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 41651.

The product of its (nonzero) digits is 144, while the sum is 21.

The square root of 209121141 is about 14461.0214369525. The cubic root of 209121141 is about 593.5618502499.

It can be divided in two parts, 2091 and 21141, that added together give a palindrome (23232).

The spelling of 209121141 in words is "two hundred nine million, one hundred twenty-one thousand, one hundred forty-one".