77241021 has 32 divisors (see below), whose sum is σ = 121564800. Its totient is φ = 43008000.

The previous prime is 77241001. The next prime is 77241041. The reversal of 77241021 is 12014277.

It is an interprime number because it is at equal distance from previous prime (77241001) and next prime (77241041).

It is not a de Polignac number, because 77241021 - 2²⁵ = 43686589 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 77240982 and 77241000.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (77241001) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 171805 + ... + 172253.

It is an arithmetic number, because the mean of its divisors is an integer number (3798900).

Almost surely, 2^77241021 is an apocalyptic number.

It is an amenable number.

77241021 is a deficient number, since it is larger than the sum of its proper divisors (44323779).

77241021 is a wasteful number, since it uses less digits than its factorization.

77241021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 877.

The product of its (nonzero) digits is 784, while the sum is 24.

The square root of 77241021 is about 8788.6871033164. The cubic root of 77241021 is about 425.8755119068.

Adding to 77241021 its reverse (12014277), we get a palindrome (89255298).

The spelling of 77241021 in words is "seventy-seven million, two hundred forty-one thousand, twenty-one".