77732301272021 has 16 divisors (see below), whose sum is σ = 89662250711040. Its totient is φ = 66646271095920.

The previous prime is 77732301271991. The next prime is 77732301272053. The reversal of 77732301272021 is 12027210323777.

It is a cyclic number.

It is not a de Polignac number, because 77732301272021 - 2²² = 77732297077717 is a prime.

It is a super-2 number, since 2×77732301272021² (a number of 29 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 (77732301272921) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 833865695 + ... + 833958908.

It is an arithmetic number, because the mean of its divisors is an integer number (5603890669440).

Almost surely, 2^{77732301272021} is an apocalyptic number.

It is an amenable number.

77732301272021 is a deficient number, since it is larger than the sum of its proper divisors (11929949439019).

77732301272021 is a wasteful number, since it uses less digits than its factorization.

77732301272021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1667824856.

The product of its (nonzero) digits is 345744, while the sum is 44.

Adding to 77732301272021 its reverse (12027210323777), we get a palindrome (89759511595798).

The spelling of 77732301272021 in words is "seventy-seven trillion, seven hundred thirty-two billion, three hundred one million, two hundred seventy-two thousand, twenty-one".