21444020102 has 16 divisors (see below), whose sum is σ = 32575888800. Its totient is φ = 10586252928.

The previous prime is 21444020071. The next prime is 21444020111. The reversal of 21444020102 is 20102044412.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 165683 + ... + 265214.

It is an arithmetic number, because the mean of its divisors is an integer number (2035993050).

Almost surely, 2^21444020102 is an apocalyptic number.

21444020102 is a deficient number, since it is larger than the sum of its proper divisors (11131868698).

21444020102 is a wasteful number, since it uses less digits than its factorization.

21444020102 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 431215.

The product of its (nonzero) digits is 512, while the sum is 20.

Adding to 21444020102 its reverse (20102044412), we get a palindrome (41546064514).

The spelling of 21444020102 in words is "twenty-one billion, four hundred forty-four million, twenty thousand, one hundred two".