7577121421 has 8 divisors (see below), whose sum is σ = 7849117080. Its totient is φ = 7305840192.

The previous prime is 7577121407. The next prime is 7577121437. The reversal of 7577121421 is 1241217757.

7577121421 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 4 ways, for example, as 1259256196 + 6317865225 = 35486^2 + 79485^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 7577121421 - 2⁵ = 7577121389 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7577121821) 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, 156970 + ... + 199483.

It is an arithmetic number, because the mean of its divisors is an integer number (981139635).

Almost surely, 2^7577121421 is an apocalyptic number.

It is an amenable number.

7577121421 is a deficient number, since it is larger than the sum of its proper divisors (271995659).

7577121421 is a wasteful number, since it uses less digits than its factorization.

7577121421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 357215.

The product of its digits is 27440, while the sum is 37.

The square root of 7577121421 is about 87046.6623197007. The cubic root of 7577121421 is about 1964.1202908066.

The spelling of 7577121421 in words is "seven billion, five hundred seventy-seven million, one hundred twenty-one thousand, four hundred twenty-one".