21552015543411 has 8 divisors (see below), whose sum is σ = 28737839868624. Its totient is φ = 14367100790240.

The previous prime is 21552015543379. The next prime is 21552015543433. The reversal of 21552015543411 is 11434551025512.

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 21552015543411 - 2⁵ = 21552015543379 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 21552015543411.

It is not an unprimeable number, because it can be changed into a prime (21552015543491) 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, 227337720 + ... + 227432501.

It is an arithmetic number, because the mean of its divisors is an integer number (3592229983578).

Almost surely, 2^{21552015543411} is an apocalyptic number.

21552015543411 is a deficient number, since it is larger than the sum of its proper divisors (7185824325213).

21552015543411 is a wasteful number, since it uses less digits than its factorization.

21552015543411 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 454786021.

The product of its (nonzero) digits is 120000, while the sum is 39.

Adding to 21552015543411 its reverse (11434551025512), we get a palindrome (32986566568923).

The spelling of 21552015543411 in words is "twenty-one trillion, five hundred fifty-two billion, fifteen million, five hundred forty-three thousand, four hundred eleven".