21555012245411 has 4 divisors (see below), whose sum is σ = 21582897126192. Its totient is φ = 21527127364632.

The previous prime is 21555012245383. The next prime is 21555012245489. The reversal of 21555012245411 is 11454221055512.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21555012245411 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21555012545411) 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, 13942439231 + ... + 13942440776.

It is an arithmetic number, because the mean of its divisors is an integer number (5395724281548).

Almost surely, 2^{21555012245411} is an apocalyptic number.

21555012245411 is a deficient number, since it is larger than the sum of its proper divisors (27884880781).

21555012245411 is an equidigital number, since it uses as much as digits as its factorization.

21555012245411 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27884880780.

The product of its (nonzero) digits is 80000, while the sum is 38.

The spelling of 21555012245411 in words is "twenty-one trillion, five hundred fifty-five billion, twelve million, two hundred forty-five thousand, four hundred eleven".