121451213 has 8 divisors (see below), whose sum is σ = 138487608. Its totient is φ = 105513984.

The previous prime is 121451191. The next prime is 121451219. The reversal of 121451213 is 312154121.

It can be written as a sum of positive squares in 4 ways, for example, as 10738729 + 110712484 = 3277^2 + 10522^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 121451213 - 2¹⁸ = 121189069 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 (121451219) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 274556 + ... + 274997.

It is an arithmetic number, because the mean of its divisors is an integer number (17310951).

Almost surely, 2^121451213 is an apocalyptic number.

121451213 is a gapful number since it is divisible by the number (13) formed by its first and last digit.

It is an amenable number.

121451213 is a deficient number, since it is larger than the sum of its proper divisors (17036395).

121451213 is a wasteful number, since it uses less digits than its factorization.

121451213 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 549583.

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

The square root of 121451213 is about 11020.4905970651. The cubic root of 121451213 is about 495.2227858153. Note that the first 3 decimals are identical.

The spelling of 121451213 in words is "one hundred twenty-one million, four hundred fifty-one thousand, two hundred thirteen".