21144102444 has 72 divisors (see below), whose sum is σ = 57141171360. Its totient is φ = 6569021952.

The previous prime is 21144102439. The next prime is 21144102457. The reversal of 21144102444 is 44420144112.

It is a happy number.

21144102444 is a `hidden beast` number, since 2 + 1 + 1 + 4 + 410 + 244 + 4 = 666.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 104679 + ... + 230750.

It is an arithmetic number, because the mean of its divisors is an integer number (793627380).

Almost surely, 2^21144102444 is an apocalyptic number.

It is an amenable number.

21144102444 is an abundant number, since it is smaller than the sum of its proper divisors (35997068916).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21144102444 is a wasteful number, since it uses less digits than its factorization.

21144102444 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 335559 (or 335554 counting only the distinct ones).

The product of its (nonzero) digits is 4096, while the sum is 27.

Adding to 21144102444 its reverse (44420144112), we get a palindrome (65564246556).

The spelling of 21144102444 in words is "twenty-one billion, one hundred forty-four million, one hundred two thousand, four hundred forty-four".