12435653421 has 6 divisors (see below), whose sum is σ = 17962610510. Its totient is φ = 8290435608.

The previous prime is 12435653413. The next prime is 12435653467.

12435653421 is a `hidden beast` number, since 1 + 2 + 43 + 565 + 34 + 21 = 666.

12435653421 is nontrivially palindromic in base 10.

It can be written as a sum of positive squares in only one way, i.e., 11211633225 + 1224020196 = 105885^2 + 34986^2 .

It is not a de Polignac number, because 12435653421 - 2³ = 12435653413 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 (12435653401) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 690869626 + ... + 690869643.

Almost surely, 2^12435653421 is an apocalyptic number.

It is an amenable number.

12435653421 is a deficient number, since it is larger than the sum of its proper divisors (5526957089).

12435653421 is a wasteful number, since it uses less digits than its factorization.

12435653421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1381739275 (or 1381739272 counting only the distinct ones).

The product of its digits is 86400, while the sum is 36.

It can be divided in two parts, 12435 and 653421, that added together give a square (665856 = 816²).

The spelling of 12435653421 in words is "twelve billion, four hundred thirty-five million, six hundred fifty-three thousand, four hundred twenty-one".