12019192021 has 4 divisors (see below), whose sum is σ = 12222907200. Its totient is φ = 11815476844.

The previous prime is 12019191997. The next prime is 12019192043. The reversal of 12019192021 is 12029191021.

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, and also an emirpimes, since its reverse is a distinct semiprime: 12029191021 = 7757 ⋅1550753.

It is a cyclic number.

It is not a de Polignac number, because 12019192021 - 2¹⁵ = 12019159253 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 (12019192051) 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, 101857501 + ... + 101857618.

It is an arithmetic number, because the mean of its divisors is an integer number (3055726800).

Almost surely, 2^12019192021 is an apocalyptic number.

It is an amenable number.

12019192021 is a deficient number, since it is larger than the sum of its proper divisors (203715179).

12019192021 is an equidigital number, since it uses as much as digits as its factorization.

12019192021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 203715178.

The product of its (nonzero) digits is 648, while the sum is 28.

It can be divided in two parts, 120191 and 92021, that added together give a palindrome (212212).

The spelling of 12019192021 in words is "twelve billion, nineteen million, one hundred ninety-two thousand, twenty-one".