78241021 has 8 divisors (see below), whose sum is σ = 84248640. Its totient is φ = 72389568.

The previous prime is 78241001. The next prime is 78241027. The reversal of 78241021 is 12014287.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 78241021 - 2⁷ = 78240893 is a prime.

It is a super-2 number, since 2×78241021² = 12243314734244882, 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 (78241027) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 38001 + ... + 40006.

It is an arithmetic number, because the mean of its divisors is an integer number (10531080).

Almost surely, 2^78241021 is an apocalyptic number.

It is an amenable number.

78241021 is a deficient number, since it is larger than the sum of its proper divisors (6007619).

78241021 is a wasteful number, since it uses less digits than its factorization.

78241021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 78083.

The product of its (nonzero) digits is 896, while the sum is 25.

The square root of 78241021 is about 8845.3954688301. The cubic root of 78241021 is about 427.7055013264.

The spelling of 78241021 in words is "seventy-eight million, two hundred forty-one thousand, twenty-one".