67121220 has 48 divisors (see below), whose sum is σ = 188955648. Its totient is φ = 17802240.

The previous prime is 67121191. The next prime is 67121221. The reversal of 67121220 is 2212176.

It is not an unprimeable number, because it can be changed into a prime (67121221) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (5) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 8532 + ... + 14388.

It is an arithmetic number, because the mean of its divisors is an integer number (3936576).

Almost surely, 2^67121220 is an apocalyptic number.

67121220 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

67121220 is an abundant number, since it is smaller than the sum of its proper divisors (121834428).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

67121220 is a wasteful number, since it uses less digits than its factorization.

67121220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6060 (or 6058 counting only the distinct ones).

The product of its (nonzero) digits is 336, while the sum is 21.

The square root of 67121220 is about 8192.7541156805. The cubic root of 67121220 is about 406.3996081718.

Adding to 67121220 its reverse (2212176), we get a palindrome (69333396).

The spelling of 67121220 in words is "sixty-seven million, one hundred twenty-one thousand, two hundred twenty".