77214121 has 4 divisors (see below), whose sum is σ = 77231700. Its totient is φ = 77196544.

The previous prime is 77214113. The next prime is 77214127. The reversal of 77214121 is 12141277.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 29106025 + 48108096 = 5395^2 + 6936^2 .

It is a cyclic number.

It is not a de Polignac number, because 77214121 - 2³ = 77214113 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (77214127) 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, 4125 + ... + 13093.

It is an arithmetic number, because the mean of its divisors is an integer number (19307925).

Almost surely, 2^77214121 is an apocalyptic number.

It is an amenable number.

77214121 is a deficient number, since it is larger than the sum of its proper divisors (17579).

77214121 is an equidigital number, since it uses as much as digits as its factorization.

77214121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17578.

The product of its digits is 784, while the sum is 25.

The square root of 77214121 is about 8787.1565935745. The cubic root of 77214121 is about 425.8260676207.

Adding to 77214121 its reverse (12141277), we get a palindrome (89355398).

The spelling of 77214121 in words is "seventy-seven million, two hundred fourteen thousand, one hundred twenty-one".