12077021551721 has 4 divisors (see below), whose sum is σ = 13802310344832. Its totient is φ = 10351732758612.

The previous prime is 12077021551669. The next prime is 12077021551723. The reversal of 12077021551721 is 12715512077021.

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 not a de Polignac number, because 12077021551721 - 2⁴² = 7678975040617 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12077021551723) 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, 862644396545 + ... + 862644396558.

It is an arithmetic number, because the mean of its divisors is an integer number (3450577586208).

Almost surely, 2^{12077021551721} is an apocalyptic number.

It is an amenable number.

12077021551721 is a deficient number, since it is larger than the sum of its proper divisors (1725288793111).

12077021551721 is an equidigital number, since it uses as much as digits as its factorization.

12077021551721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1725288793110.

The product of its (nonzero) digits is 68600, while the sum is 41.

The spelling of 12077021551721 in words is "twelve trillion, seventy-seven billion, twenty-one million, five hundred fifty-one thousand, seven hundred twenty-one".