121621667 has 4 divisors (see below), whose sum is σ = 121724136. Its totient is φ = 121519200.

The previous prime is 121621589. The next prime is 121621763. The reversal of 121621667 is 766126121.

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 121621667 - 2¹⁰ = 121620643 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (121621067) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 49433 + ... + 51834.

It is an arithmetic number, because the mean of its divisors is an integer number (30431034).

Almost surely, 2^121621667 is an apocalyptic number.

121621667 is a deficient number, since it is larger than the sum of its proper divisors (102469).

121621667 is a wasteful number, since it uses less digits than its factorization.

121621667 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 102468.

The product of its digits is 6048, while the sum is 32.

The square root of 121621667 is about 11028.2213887825. The cubic root of 121621667 is about 495.4543554664.

Adding to 121621667 its reverse (766126121), we get a palindrome (887747788).

The spelling of 121621667 in words is "one hundred twenty-one million, six hundred twenty-one thousand, six hundred sixty-seven".