76121421 has 16 divisors (see below), whose sum is σ = 106131840. Its totient is φ = 48438720.

The previous prime is 76121417. The next prime is 76121449. The reversal of 76121421 is 12412167.

It is not a de Polignac number, because 76121421 - 2² = 76121417 is a prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 76121391 and 76121400.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (76121411) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 44775 + ... + 46443.

It is an arithmetic number, because the mean of its divisors is an integer number (6633240).

Almost surely, 2^76121421 is an apocalyptic number.

It is an amenable number.

76121421 is a deficient number, since it is larger than the sum of its proper divisors (30010419).

76121421 is a wasteful number, since it uses less digits than its factorization.

76121421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2356.

The product of its digits is 672, while the sum is 24.

The square root of 76121421 is about 8724.7590797683. The cubic root of 76121421 is about 423.8078164427.

Adding to 76121421 its reverse (12412167), we get a palindrome (88533588).

The spelling of 76121421 in words is "seventy-six million, one hundred twenty-one thousand, four hundred twenty-one".