12021043541 has 16 divisors (see below), whose sum is σ = 13551318144. Its totient is φ = 10580332224.

The previous prime is 12021043523. The next prime is 12021043571. The reversal of 12021043541 is 14534012021.

It is a cyclic number.

It is not a de Polignac number, because 12021043541 - 2⁶ = 12021043477 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (23).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12021043511) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 31370 + ... + 158196.

It is an arithmetic number, because the mean of its divisors is an integer number (846957384).

Almost surely, 2^12021043541 is an apocalyptic number.

It is an amenable number.

12021043541 is a deficient number, since it is larger than the sum of its proper divisors (1530274603).

12021043541 is a wasteful number, since it uses less digits than its factorization.

12021043541 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 127180.

The product of its (nonzero) digits is 960, while the sum is 23.

Adding to 12021043541 its reverse (14534012021), we get a palindrome (26555055562).

The spelling of 12021043541 in words is "twelve billion, twenty-one million, forty-three thousand, five hundred forty-one".