21153027841663 has 16 divisors (see below), whose sum is σ = 22352592153600. Its totient is φ = 19976796496800.

The previous prime is 21153027841651. The next prime is 21153027841691. The reversal of 21153027841663 is 36614872035112.

It is a cyclic number.

It is not a de Polignac number, because 21153027841663 - 2⁹ = 21153027841151 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21153027847663) 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, 119562873 + ... + 119739661.

It is an arithmetic number, because the mean of its divisors is an integer number (1397037009600).

Almost surely, 2^{21153027841663} is an apocalyptic number.

21153027841663 is a gapful number since it is divisible by the number (23) formed by its first and last digit.

21153027841663 is a deficient number, since it is larger than the sum of its proper divisors (1199564311937).

21153027841663 is a wasteful number, since it uses less digits than its factorization.

21153027841663 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 242742.

The product of its (nonzero) digits is 1451520, while the sum is 49.

Adding to 21153027841663 its reverse (36614872035112), we get a palindrome (57767899876775).

The spelling of 21153027841663 in words is "twenty-one trillion, one hundred fifty-three billion, twenty-seven million, eight hundred forty-one thousand, six hundred sixty-three".