12027691621 has 4 divisors (see below), whose sum is σ = 13121118144. Its totient is φ = 10934265100.

The previous prime is 12027691603. The next prime is 12027691633. The reversal of 12027691621 is 12619672021.

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 12027691621 - 2⁷ = 12027691493 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 (12027691321) 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, 546713245 + ... + 546713266.

It is an arithmetic number, because the mean of its divisors is an integer number (3280279536).

Almost surely, 2^12027691621 is an apocalyptic number.

12027691621 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

12027691621 is a deficient number, since it is larger than the sum of its proper divisors (1093426523).

12027691621 is a wasteful number, since it uses less digits than its factorization.

12027691621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1093426522.

The product of its (nonzero) digits is 18144, while the sum is 37.

The spelling of 12027691621 in words is "twelve billion, twenty-seven million, six hundred ninety-one thousand, six hundred twenty-one".