21115655254641 has 16 divisors (see below), whose sum is σ = 28171955105280. Its totient is φ = 14068230965760.

The previous prime is 21115655254633. The next prime is 21115655254651. The reversal of 21115655254641 is 14645255651112.

It is not a de Polignac number, because 21115655254641 - 2³ = 21115655254633 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21115655254651) 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, 57512736 + ... + 57878718.

It is an arithmetic number, because the mean of its divisors is an integer number (1760747194080).

Almost surely, 2^{21115655254641} is an apocalyptic number.

It is an amenable number.

21115655254641 is a deficient number, since it is larger than the sum of its proper divisors (7056299850639).

21115655254641 is a wasteful number, since it uses less digits than its factorization.

21115655254641 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 378056.

The product of its digits is 1440000, while the sum is 48.

The spelling of 21115655254641 in words is "twenty-one trillion, one hundred fifteen billion, six hundred fifty-five million, two hundred fifty-four thousand, six hundred forty-one".