12066657421 has 32 divisors (see below), whose sum is σ = 15245941760. Its totient is φ = 9296861184.

The previous prime is 12066657401. The next prime is 12066657437. The reversal of 12066657421 is 12475666021.

It is a happy number.

It is not a de Polignac number, because 12066657421 - 2⁷ = 12066657293 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12066657401) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 513301 + ... + 536293.

It is an arithmetic number, because the mean of its divisors is an integer number (476435680).

Almost surely, 2^12066657421 is an apocalyptic number.

It is an amenable number.

12066657421 is a deficient number, since it is larger than the sum of its proper divisors (3179284339).

12066657421 is a wasteful number, since it uses less digits than its factorization.

12066657421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23165.

The product of its (nonzero) digits is 120960, while the sum is 40.

The spelling of 12066657421 in words is "twelve billion, sixty-six million, six hundred fifty-seven thousand, four hundred twenty-one".