121621886 has 8 divisors (see below), whose sum is σ = 187363560. Its totient is φ = 59167368.

The previous prime is 121621847. The next prime is 121621889. The reversal of 121621886 is 688126121.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121621889) 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, 821696 + ... + 821843.

It is an arithmetic number, because the mean of its divisors is an integer number (23420445).

Almost surely, 2^121621886 is an apocalyptic number.

121621886 is a deficient number, since it is larger than the sum of its proper divisors (65741674).

121621886 is a wasteful number, since it uses less digits than its factorization.

121621886 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1643578.

The product of its digits is 9216, while the sum is 35.

The square root of 121621886 is about 11028.2313178497. The cubic root of 121621886 is about 495.4546528488.

The spelling of 121621886 in words is "one hundred twenty-one million, six hundred twenty-one thousand, eight hundred eighty-six".