11534420021 has 8 divisors (see below), whose sum is σ = 11668611360. Its totient is φ = 11400960528.

The previous prime is 11534420017. The next prime is 11534420047. The reversal of 11534420021 is 12002443511.

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 11534420021 - 2² = 11534420017 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11534420081) 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, 151226 + ... + 214331.

It is an arithmetic number, because the mean of its divisors is an integer number (1458576420).

Almost surely, 2^11534420021 is an apocalyptic number.

It is an amenable number.

11534420021 is a deficient number, since it is larger than the sum of its proper divisors (134191339).

11534420021 is a wasteful number, since it uses less digits than its factorization.

11534420021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 365923.

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

Adding to 11534420021 its reverse (12002443511), we get a palindrome (23536863532).

The spelling of 11534420021 in words is "eleven billion, five hundred thirty-four million, four hundred twenty thousand, twenty-one".