67140021 has 16 divisors (see below), whose sum is σ = 102078144. Its totient is φ = 38886144.

The previous prime is 67140019. The next prime is 67140023. The reversal of 67140021 is 12004176.

It is an interprime number because it is at equal distance from previous prime (67140019) and next prime (67140023).

It is not a de Polignac number, because 67140021 - 2¹ = 67140019 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 67140021.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (67140023) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 49971 + ... + 51296.

It is an arithmetic number, because the mean of its divisors is an integer number (6379884).

Almost surely, 2^67140021 is an apocalyptic number.

It is an amenable number.

67140021 is a deficient number, since it is larger than the sum of its proper divisors (34938123).

67140021 is a wasteful number, since it uses less digits than its factorization.

67140021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 101300.

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

The square root of 67140021 is about 8193.9014516895. The cubic root of 67140021 is about 406.4375495051.

Adding to 67140021 its reverse (12004176), we get a palindrome (79144197).

The spelling of 67140021 in words is "sixty-seven million, one hundred forty thousand, twenty-one".