67999421 has 8 divisors (see below), whose sum is σ = 77885184. Its totient is φ = 58156560.

The previous prime is 67999417. The next prime is 67999429. The reversal of 67999421 is 12499976.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 67999421 - 2² = 67999417 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (67999429) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7250 + ... + 13731.

It is an arithmetic number, because the mean of its divisors is an integer number (9735648).

Almost surely, 2^67999421 is an apocalyptic number.

It is an amenable number.

67999421 is a deficient number, since it is larger than the sum of its proper divisors (9885763).

67999421 is a wasteful number, since it uses less digits than its factorization.

67999421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21451.

The product of its digits is 244944, while the sum is 47.

The square root of 67999421 is about 8246.1761441289. The cubic root of 67999421 is about 408.1643517187.

The spelling of 67999421 in words is "sixty-seven million, nine hundred ninety-nine thousand, four hundred twenty-one".