121421313 has 24 divisors (see below), whose sum is σ = 190630440. Its totient is φ = 74027520.

The previous prime is 121421303. The next prime is 121421317. The reversal of 121421313 is 313124121.

It can be written as a sum of positive squares in 4 ways, for example, as 8573184 + 112848129 = 2928^2 + 10623^2 .

It is not a de Polignac number, because 121421313 - 2⁴ = 121421297 is a prime.

It is not an unprimeable number, because it can be changed into a prime (121421317) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 7993 + ... + 17513.

It is an arithmetic number, because the mean of its divisors is an integer number (7942935).

Almost surely, 2^121421313 is an apocalyptic number.

121421313 is a gapful number since it is divisible by the number (13) formed by its first and last digit.

It is an amenable number.

121421313 is a deficient number, since it is larger than the sum of its proper divisors (69209127).

121421313 is a wasteful number, since it uses less digits than its factorization.

121421313 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9649 (or 9646 counting only the distinct ones).

The product of its digits is 144, while the sum is 18.

The square root of 121421313 is about 11019.1339496351. The cubic root of 121421313 is about 495.1821429480.

Adding to 121421313 its reverse (313124121), we get a palindrome (434545434).

The spelling of 121421313 in words is "one hundred twenty-one million, four hundred twenty-one thousand, three hundred thirteen".