121816451 has 8 divisors (see below), whose sum is σ = 123999504. Its totient is φ = 119639520.

The previous prime is 121816447. The next prime is 121816459. The reversal of 121816451 is 154618121.

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 121816451 - 2² = 121816447 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (121816459) 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, 59816 + ... + 61818.

It is an arithmetic number, because the mean of its divisors is an integer number (15499938).

Almost surely, 2^121816451 is an apocalyptic number.

121816451 is a deficient number, since it is larger than the sum of its proper divisors (2183053).

121816451 is an equidigital number, since it uses as much as digits as its factorization.

121816451 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3061.

The product of its digits is 1920, while the sum is 29.

The square root of 121816451 is about 11037.0490168342. The cubic root of 121816451 is about 495.7187138084.

The spelling of 121816451 in words is "one hundred twenty-one million, eight hundred sixteen thousand, four hundred fifty-one".