77316812421 has 8 divisors (see below), whose sum is σ = 103264705824. Its totient is φ = 51456730320.

The previous prime is 77316812411. The next prime is 77316812431. The reversal of 77316812421 is 12421861377.

It is an interprime number because it is at equal distance from previous prime (77316812411) and next prime (77316812431).

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

It is not a de Polignac number, because 77316812421 - 2⁹ = 77316811909 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (77316812401) 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, 21950770 + ... + 21954291.

It is an arithmetic number, because the mean of its divisors is an integer number (12908088228).

Almost surely, 2^77316812421 is an apocalyptic number.

It is an amenable number.

77316812421 is a deficient number, since it is larger than the sum of its proper divisors (25947893403).

77316812421 is a wasteful number, since it uses less digits than its factorization.

77316812421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 43905651.

The product of its digits is 112896, while the sum is 42.

The spelling of 77316812421 in words is "seventy-seven billion, three hundred sixteen million, eight hundred twelve thousand, four hundred twenty-one".