121621887 has 12 divisors (see below), whose sum is σ = 176960160. Its totient is φ = 80488608.

The previous prime is 121621847. The next prime is 121621889. The reversal of 121621887 is 788126121.

121621887 is a `hidden beast` number, since 1 + 21 + 621 + 8 + 8 + 7 = 666.

It is not a de Polignac number, because 121621887 - 2⁶ = 121621823 is a prime.

It is a super-3 number, since 3×121621887³ (a number of 25 digits) contains 333 as substring.

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 11 ways as a sum of consecutive naturals, for example, 48087 + ... + 50552.

It is an arithmetic number, because the mean of its divisors is an integer number (14746680).

Almost surely, 2^121621887 is an apocalyptic number.

121621887 is a deficient number, since it is larger than the sum of its proper divisors (55338273).

121621887 is a wasteful number, since it uses less digits than its factorization.

121621887 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 98782 (or 98779 counting only the distinct ones).

The product of its digits is 10752, while the sum is 36.

The square root of 121621887 is about 11028.2313631878. The cubic root of 121621887 is about 495.4546542067.

The spelling of 121621887 in words is "one hundred twenty-one million, six hundred twenty-one thousand, eight hundred eighty-seven".