12021881641 has 8 divisors (see below), whose sum is σ = 14988320064. Its totient is φ = 9367699920.

The previous prime is 12021881639. The next prime is 12021881681. The reversal of 12021881641 is 14618812021.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 12021881641 - 2¹ = 12021881639 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 12021881597 and 12021881606.

It is not an unprimeable number, because it can be changed into a prime (12021881611) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 78064090 + ... + 78064243.

It is an arithmetic number, because the mean of its divisors is an integer number (1873540008).

Almost surely, 2^12021881641 is an apocalyptic number.

12021881641 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

12021881641 is a deficient number, since it is larger than the sum of its proper divisors (2966438423).

12021881641 is a wasteful number, since it uses less digits than its factorization.

12021881641 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 156128351.

The product of its (nonzero) digits is 6144, while the sum is 34.

The spelling of 12021881641 in words is "twelve billion, twenty-one million, eight hundred eighty-one thousand, six hundred forty-one".