67421281 has 4 divisors (see below), whose sum is σ = 67774464. Its totient is φ = 67068100.

The previous prime is 67421273. The next prime is 67421309. The reversal of 67421281 is 18212476.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 67421281 - 2³ = 67421273 is a prime.

It is a super-2 number, since 2×67421281² = 9091258263361922, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (67421381) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 176305 + ... + 176686.

It is an arithmetic number, because the mean of its divisors is an integer number (16943616).

Almost surely, 2^67421281 is an apocalyptic number.

It is an amenable number.

67421281 is a deficient number, since it is larger than the sum of its proper divisors (353183).

67421281 is a wasteful number, since it uses less digits than its factorization.

67421281 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 353182.

The product of its digits is 5376, while the sum is 31.

The square root of 67421281 is about 8211.0462792509. The cubic root of 67421281 is about 407.0043022242.

The spelling of 67421281 in words is "sixty-seven million, four hundred twenty-one thousand, two hundred eighty-one".