77111421 has 8 divisors (see below), whose sum is σ = 102913344. Its totient is φ = 51358560.

The previous prime is 77111417. The next prime is 77111429. The reversal of 77111421 is 12411177.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 77111421 - 2² = 77111417 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 77111391 and 77111400.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (77111429) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8425 + ... + 15006.

It is an arithmetic number, because the mean of its divisors is an integer number (12864168).

Almost surely, 2^77111421 is an apocalyptic number.

It is an amenable number.

77111421 is a deficient number, since it is larger than the sum of its proper divisors (25801923).

77111421 is a wasteful number, since it uses less digits than its factorization.

77111421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24531.

The product of its digits is 392, while the sum is 24.

The square root of 77111421 is about 8781.3108930273. The cubic root of 77111421 is about 425.6371913724.

Adding to 77111421 its reverse (12411177), we get a palindrome (89522598).

The spelling of 77111421 in words is "seventy-seven million, one hundred eleven thousand, four hundred twenty-one".