67121621 has 12 divisors (see below), whose sum is σ = 78249600. Its totient is φ = 57408120.

The previous prime is 67121617. The next prime is 67121629. The reversal of 67121621 is 12612176.

It is not a de Polignac number, because 67121621 - 2² = 67121617 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (67121629) 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, 26780 + ... + 29178.

It is an arithmetic number, because the mean of its divisors is an integer number (6520800).

Almost surely, 2^67121621 is an apocalyptic number.

It is an amenable number.

67121621 is a deficient number, since it is larger than the sum of its proper divisors (11127979).

67121621 is a wasteful number, since it uses less digits than its factorization.

67121621 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2984 (or 2977 counting only the distinct ones).

The product of its digits is 1008, while the sum is 26.

The square root of 67121621 is about 8192.7785884888. The cubic root of 67121621 is about 406.4004174832.

Adding to 67121621 its reverse (12612176), we get a palindrome (79733797).

The spelling of 67121621 in words is "sixty-seven million, one hundred twenty-one thousand, six hundred twenty-one".