121816667 has 4 divisors (see below), whose sum is σ = 139219056. Its totient is φ = 104414280.

The previous prime is 121816663. The next prime is 121816687. The reversal of 121816667 is 766618121.

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 121816667 - 2² = 121816663 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 121816667.

It is not an unprimeable number, because it can be changed into a prime (121816661) 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, 8701184 + ... + 8701197.

It is an arithmetic number, because the mean of its divisors is an integer number (34804764).

Almost surely, 2^121816667 is an apocalyptic number.

121816667 is a deficient number, since it is larger than the sum of its proper divisors (17402389).

121816667 is an equidigital number, since it uses as much as digits as its factorization.

121816667 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17402388.

The product of its digits is 24192, while the sum is 38.

The square root of 121816667 is about 11037.0588020541. The cubic root of 121816667 is about 495.7190068043.

The spelling of 121816667 in words is "one hundred twenty-one million, eight hundred sixteen thousand, six hundred sixty-seven".