121621678 has 8 divisors (see below), whose sum is σ = 185423400. Its totient is φ = 59813880.

The previous prime is 121621589. The next prime is 121621763. The reversal of 121621678 is 876126121.

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 498328 + ... + 498571.

It is an arithmetic number, because the mean of its divisors is an integer number (23177925).

Almost surely, 2^121621678 is an apocalyptic number.

121621678 is a deficient number, since it is larger than the sum of its proper divisors (63801722).

121621678 is an equidigital number, since it uses as much as digits as its factorization.

121621678 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 996962.

The product of its digits is 8064, while the sum is 34.

The square root of 121621678 is about 11028.2218875030. The cubic root of 121621678 is about 495.4543704034.

Adding to 121621678 its reverse (876126121), we get a palindrome (997747799).

The spelling of 121621678 in words is "one hundred twenty-one million, six hundred twenty-one thousand, six hundred seventy-eight".