12021653651641 has 4 divisors (see below), whose sum is σ = 12034034346384. Its totient is φ = 12009272956900.

The previous prime is 12021653651629. The next prime is 12021653651747. The reversal of 12021653651641 is 14615635612021.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 12021653651641 - 2²⁵ = 12021620097209 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12021653651141) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6190345915 + ... + 6190347856.

It is an arithmetic number, because the mean of its divisors is an integer number (3008508586596).

Almost surely, 2^{12021653651641} is an apocalyptic number.

It is an amenable number.

12021653651641 is a deficient number, since it is larger than the sum of its proper divisors (12380694743).

12021653651641 is an equidigital number, since it uses as much as digits as its factorization.

12021653651641 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12380694742.

The product of its (nonzero) digits is 259200, while the sum is 43.

The spelling of 12021653651641 in words is "twelve trillion, twenty-one billion, six hundred fifty-three million, six hundred fifty-one thousand, six hundred forty-one".