77021201 has 4 divisors (see below), whose sum is σ = 77815332. Its totient is φ = 76227072.

The previous prime is 77021183. The next prime is 77021239. The reversal of 77021201 is 10212077.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 34105600 + 42915601 = 5840^2 + 6551^2 .

It is a cyclic number.

It is not a de Polignac number, because 77021201 - 2¹⁴ = 77004817 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (77021291) 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, 396920 + ... + 397113.

It is an arithmetic number, because the mean of its divisors is an integer number (19453833).

Almost surely, 2^77021201 is an apocalyptic number.

It is an amenable number.

77021201 is a deficient number, since it is larger than the sum of its proper divisors (794131).

77021201 is an equidigital number, since it uses as much as digits as its factorization.

77021201 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 794130.

The product of its (nonzero) digits is 196, while the sum is 20.

The square root of 77021201 is about 8776.1723433397. The cubic root of 77021201 is about 425.4711287538.

Adding to 77021201 its reverse (10212077), we get a palindrome (87233278).

The spelling of 77021201 in words is "seventy-seven million, twenty-one thousand, two hundred one".