21144544101 has 32 divisors (see below), whose sum is σ = 31446455040. Its totient is φ = 14041944000.

The previous prime is 21144544081. The next prime is 21144544111. The reversal of 21144544101 is 10144544112.

It is a happy number.

21144544101 is a `hidden beast` number, since 2 + 1 + 14 + 4 + 544 + 101 = 666.

It is not a de Polignac number, because 21144544101 - 2¹⁷ = 21144413029 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21144544111) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 9519171 + ... + 9521391.

It is an arithmetic number, because the mean of its divisors is an integer number (982701720).

Almost surely, 2^21144544101 is an apocalyptic number.

It is an amenable number.

21144544101 is a deficient number, since it is larger than the sum of its proper divisors (10301910939).

21144544101 is a wasteful number, since it uses less digits than its factorization.

21144544101 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3434 (or 3428 counting only the distinct ones).

The product of its (nonzero) digits is 2560, while the sum is 27.

The spelling of 21144544101 in words is "twenty-one billion, one hundred forty-four million, five hundred forty-four thousand, one hundred one".