67451421 has 16 divisors (see below), whose sum is σ = 91922688. Its totient is φ = 43982400.

The previous prime is 67451413. The next prime is 67451471. The reversal of 67451421 is 12415476.

It is not a de Polignac number, because 67451421 - 2³ = 67451413 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (67451411) 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, 35116 + ... + 36986.

It is an arithmetic number, because the mean of its divisors is an integer number (5745168).

Almost surely, 2^67451421 is an apocalyptic number.

67451421 is a gapful number since it is divisible by the number (61) formed by its first and last digit.

It is an amenable number.

67451421 is a deficient number, since it is larger than the sum of its proper divisors (24471267).

67451421 is a wasteful number, since it uses less digits than its factorization.

67451421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2132.

The product of its digits is 6720, while the sum is 30.

The square root of 67451421 is about 8212.8814066684. The cubic root of 67451421 is about 407.0649422376.

Adding to 67451421 its reverse (12415476), we get a palindrome (79866897).

The spelling of 67451421 in words is "sixty-seven million, four hundred fifty-one thousand, four hundred twenty-one".