77735204600021 has 8 divisors (see below), whose sum is σ = 77856014900664. Its totient is φ = 77614422558400.

The previous prime is 77735204599963. The next prime is 77735204600063. The reversal of 77735204600021 is 12000640253777.

It can be written as a sum of positive squares in 4 ways, for example, as 16038735415921 + 61696469184100 = 4004839^2 + 7854710^2 .

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 77735204600021 - 2³⁴ = 77718024730837 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (77735204600621) 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, 1555526 + ... + 12565431.

It is an arithmetic number, because the mean of its divisors is an integer number (9732001862583).

Almost surely, 2^{77735204600021} is an apocalyptic number.

It is an amenable number.

77735204600021 is a deficient number, since it is larger than the sum of its proper divisors (120810300643).

77735204600021 is a wasteful number, since it uses less digits than its factorization.

77735204600021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14129511.

The product of its (nonzero) digits is 493920, while the sum is 44.

Adding to 77735204600021 its reverse (12000640253777), we get a palindrome (89735844853798).

The spelling of 77735204600021 in words is "seventy-seven trillion, seven hundred thirty-five billion, two hundred four million, six hundred thousand, twenty-one".