21144155355 has 48 divisors (see below), whose sum is σ = 38542742784. Its totient is φ = 11118008160.

The previous prime is 21144155327. The next prime is 21144155401. The reversal of 21144155355 is 55355144112.

21144155355 is a `hidden beast` number, since 2 + 1 + 14 + 41 + 553 + 55 = 666.

It is not a de Polignac number, because 21144155355 - 2⁸ = 21144155099 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 36289 + ... + 208818.

It is an arithmetic number, because the mean of its divisors is an integer number (802973808).

Almost surely, 2^21144155355 is an apocalyptic number.

21144155355 is a deficient number, since it is larger than the sum of its proper divisors (17398587429).

21144155355 is an equidigital number, since it uses as much as digits as its factorization.

21144155355 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 245198 (or 245186 counting only the distinct ones).

The product of its digits is 60000, while the sum is 36.

Adding to 21144155355 its reverse (55355144112), we get a palindrome (76499299467).

The spelling of 21144155355 in words is "twenty-one billion, one hundred forty-four million, one hundred fifty-five thousand, three hundred fifty-five".