121521031 has 4 divisors (see below), whose sum is σ = 121543200. Its totient is φ = 121498864.

The previous prime is 121521013. The next prime is 121521067. The reversal of 121521031 is 130125121.

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

It is a cyclic number.

It is not a de Polignac number, because 121521031 - 2⁹ = 121520519 is a prime.

It is a super-2 number, since 2×121521031² = 29534721950605922, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 121520996 and 121521014.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121521331) 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, 3810 + ... + 16048.

It is an arithmetic number, because the mean of its divisors is an integer number (30385800).

Almost surely, 2^121521031 is an apocalyptic number.

121521031 is a deficient number, since it is larger than the sum of its proper divisors (22169).

121521031 is an equidigital number, since it uses as much as digits as its factorization.

121521031 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22168.

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

The square root of 121521031 is about 11023.6577867784. The cubic root of 121521031 is about 495.3176629826.

Adding to 121521031 its reverse (130125121), we get a palindrome (251646152).

The spelling of 121521031 in words is "one hundred twenty-one million, five hundred twenty-one thousand, thirty-one".