167381421 has 4 divisors (see below), whose sum is σ = 223175232. Its totient is φ = 111587612.

The previous prime is 167381411. The next prime is 167381441. The reversal of 167381421 is 124183761.

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 167381421 - 2¹⁵ = 167348653 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (167381411) 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, 27896901 + ... + 27896906.

It is an arithmetic number, because the mean of its divisors is an integer number (55793808).

Almost surely, 2^167381421 is an apocalyptic number.

It is an amenable number.

167381421 is a deficient number, since it is larger than the sum of its proper divisors (55793811).

167381421 is an equidigital number, since it uses as much as digits as its factorization.

167381421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 55793810.

The product of its digits is 8064, while the sum is 33.

The square root of 167381421 is about 12937.5971880408. The cubic root of 167381421 is about 551.1067751786.

The spelling of 167381421 in words is "one hundred sixty-seven million, three hundred eighty-one thousand, four hundred twenty-one".