77000077021 has 4 divisors (see below), whose sum is σ = 88000088032. Its totient is φ = 66000066012.

The previous prime is 77000076949. The next prime is 77000077069. The reversal of 77000077021 is 12077000077.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 77000077021 - 2¹⁹ = 76999552733 is a prime.

It is a super-2 number, since 2×77000077021² (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 (77000077621) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5500005495 + ... + 5500005508.

It is an arithmetic number, because the mean of its divisors is an integer number (22000022008).

Almost surely, 2^77000077021 is an apocalyptic number.

It is an amenable number.

77000077021 is a deficient number, since it is larger than the sum of its proper divisors (11000011011).

77000077021 is a wasteful number, since it uses less digits than its factorization.

77000077021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11000011010.

The product of its (nonzero) digits is 4802, while the sum is 31.

Adding to 77000077021 its reverse (12077000077), we get a palindrome (89077077098).

The spelling of 77000077021 in words is "seventy-seven billion, seventy-seven thousand, twenty-one".