78356103421 has 4 divisors (see below), whose sum is σ = 78500939644. Its totient is φ = 78211267200.

The previous prime is 78356103361. The next prime is 78356103443. The reversal of 78356103421 is 12430165387.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 14814297796 + 63541805625 = 121714^2 + 252075^2 .

It is a cyclic number.

It is not a de Polignac number, because 78356103421 - 2¹³ = 78356095229 is a prime.

It is a super-2 number, since 2×78356103421² (a number of 23 digits) 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 (78356103121) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 72417300 + ... + 72418381.

It is an arithmetic number, because the mean of its divisors is an integer number (19625234911).

Almost surely, 2^78356103421 is an apocalyptic number.

It is an amenable number.

78356103421 is a deficient number, since it is larger than the sum of its proper divisors (144836223).

78356103421 is a wasteful number, since it uses less digits than its factorization.

78356103421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 144836222.

The product of its (nonzero) digits is 120960, while the sum is 40.

The spelling of 78356103421 in words is "seventy-eight billion, three hundred fifty-six million, one hundred three thousand, four hundred twenty-one".