121641013 has 4 divisors (see below), whose sum is σ = 130998028. Its totient is φ = 112284000.

The previous prime is 121641011. The next prime is 121641053. The reversal of 121641013 is 310146121.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 75916369 + 45724644 = 8713^2 + 6762^2 .

It is a cyclic number.

It is not a de Polignac number, because 121641013 - 2¹ = 121641011 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121641011) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4678488 + ... + 4678513.

It is an arithmetic number, because the mean of its divisors is an integer number (32749507).

Almost surely, 2^121641013 is an apocalyptic number.

121641013 is a gapful number since it is divisible by the number (13) formed by its first and last digit.

It is an amenable number.

121641013 is a deficient number, since it is larger than the sum of its proper divisors (9357015).

121641013 is an equidigital number, since it uses as much as digits as its factorization.

121641013 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9357014.

The product of its (nonzero) digits is 144, while the sum is 19.

The square root of 121641013 is about 11029.0984672366. The cubic root of 121641013 is about 495.4806242281.

Adding to 121641013 its reverse (310146121), we get a palindrome (431787134).

The spelling of 121641013 in words is "one hundred twenty-one million, six hundred forty-one thousand, thirteen".