34158821 has 4 divisors (see below), whose sum is σ = 34176012. Its totient is φ = 34141632.

The previous prime is 34158799. The next prime is 34158853. The reversal of 34158821 is 12885143.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 12885143 = 229 ⋅56267.

It can be written as a sum of positive squares in 2 ways, for example, as 22221796 + 11937025 = 4714^2 + 3455^2 .

It is a cyclic number.

It is not a de Polignac number, because 34158821 - 2⁶ = 34158757 is a prime.

It is a super-2 number, since 2×34158821² = 2333650104220082, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (34158121) 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 3 ways as a sum of consecutive naturals, for example, 5156 + ... + 9741.

It is an arithmetic number, because the mean of its divisors is an integer number (8544003).

Almost surely, 2^34158821 is an apocalyptic number.

It is an amenable number.

34158821 is a deficient number, since it is larger than the sum of its proper divisors (17191).

34158821 is a wasteful number, since it uses less digits than its factorization.

34158821 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17190.

The product of its digits is 7680, while the sum is 32.

The square root of 34158821 is about 5844.5548162371. The cubic root of 34158821 is about 324.4648265180.

The spelling of 34158821 in words is "thirty-four million, one hundred fifty-eight thousand, eight hundred twenty-one".