121541213 has 4 divisors (see below), whose sum is σ = 122656380. Its totient is φ = 120426048.

The previous prime is 121541209. The next prime is 121541249. The reversal of 121541213 is 312145121.

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 69672409 + 51868804 = 8347^2 + 7202^2 .

It is a cyclic number.

It is not a de Polignac number, because 121541213 - 2² = 121541209 is a prime.

It is a super-2 number, since 2×121541213² = 29544532915022738, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121540213) 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, 557420 + ... + 557637.

It is an arithmetic number, because the mean of its divisors is an integer number (30664095).

Almost surely, 2^121541213 is an apocalyptic number.

It is an amenable number.

121541213 is a deficient number, since it is larger than the sum of its proper divisors (1115167).

121541213 is a wasteful number, since it uses less digits than its factorization.

121541213 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1115166.

The product of its digits is 240, while the sum is 20.

The square root of 121541213 is about 11024.5731436641. The cubic root of 121541213 is about 495.3450819614.

Adding to 121541213 its reverse (312145121), we get a palindrome (433686334).

The spelling of 121541213 in words is "one hundred twenty-one million, five hundred forty-one thousand, two hundred thirteen".