121213501 has 4 divisors (see below), whose sum is σ = 121427100. Its totient is φ = 120999904.

The previous prime is 121213481. The next prime is 121213513. The reversal of 121213501 is 105312121.

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 32194276 + 89019225 = 5674^2 + 9435^2 .

It is a cyclic number.

It is not a de Polignac number, because 121213501 - 2¹³ = 121205309 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 (121213531) 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, 105946 + ... + 107083.

It is an arithmetic number, because the mean of its divisors is an integer number (30356775).

Almost surely, 2^121213501 is an apocalyptic number.

It is an amenable number.

121213501 is a deficient number, since it is larger than the sum of its proper divisors (213599).

121213501 is an equidigital number, since it uses as much as digits as its factorization.

121213501 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 213598.

The product of its (nonzero) digits is 60, while the sum is 16.

The square root of 121213501 is about 11009.7003138142. The cubic root of 121213501 is about 494.8994810005.

Adding to 121213501 its reverse (105312121), we get a palindrome (226525622).

The spelling of 121213501 in words is "one hundred twenty-one million, two hundred thirteen thousand, five hundred one".