21082370644 has 12 divisors (see below), whose sum is σ = 37519473600. Its totient is φ = 10362521048.

The previous prime is 21082370623. The next prime is 21082370651. The reversal of 21082370644 is 44607328012.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 44665804 + ... + 44666275.

It is an arithmetic number, because the mean of its divisors is an integer number (3126622800).

Almost surely, 2^21082370644 is an apocalyptic number.

It is an amenable number.

21082370644 is a deficient number, since it is larger than the sum of its proper divisors (16437102956).

21082370644 is a wasteful number, since it uses less digits than its factorization.

21082370644 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 89332142 (or 89332140 counting only the distinct ones).

The product of its (nonzero) digits is 64512, while the sum is 37.

Adding to 21082370644 its reverse (44607328012), we get a palindrome (65689698656).

The spelling of 21082370644 in words is "twenty-one billion, eighty-two million, three hundred seventy thousand, six hundred forty-four".