77106421 has 4 divisors (see below), whose sum is σ = 88121632. Its totient is φ = 66091212.

The previous prime is 77106397. The next prime is 77106431. The reversal of 77106421 is 12460177.

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, and also an emirpimes, since its reverse is a distinct semiprime: 12460177 = 2663 ⋅4679.

It is a cyclic number.

It is not a de Polignac number, because 77106421 - 2⁹ = 77105909 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 77106421.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (77106431) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5507595 + ... + 5507608.

It is an arithmetic number, because the mean of its divisors is an integer number (22030408).

Almost surely, 2^77106421 is an apocalyptic number.

It is an amenable number.

77106421 is a deficient number, since it is larger than the sum of its proper divisors (11015211).

77106421 is a wasteful number, since it uses less digits than its factorization.

77106421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11015210.

The product of its (nonzero) digits is 2352, while the sum is 28.

The square root of 77106421 is about 8781.0261928775. The cubic root of 77106421 is about 425.6279915594.

Adding to 77106421 its reverse (12460177), we get a palindrome (89566598).

The spelling of 77106421 in words is "seventy-seven million, one hundred six thousand, four hundred twenty-one".