21002331982 has 8 divisors (see below), whose sum is σ = 31504147416. Its totient is φ = 10500949512.

The previous prime is 21002331953. The next prime is 21002331983. The reversal of 21002331982 is 28913320012.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21002331983) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 75228 + ... + 218320.

It is an arithmetic number, because the mean of its divisors is an integer number (3938018427).

Almost surely, 2^21002331982 is an apocalyptic number.

21002331982 is a deficient number, since it is larger than the sum of its proper divisors (10501815434).

21002331982 is a wasteful number, since it uses less digits than its factorization.

21002331982 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 216482.

The product of its (nonzero) digits is 5184, while the sum is 31.

Adding to 21002331982 its reverse (28913320012), we get a palindrome (49915651994).

The spelling of 21002331982 in words is "twenty-one billion, two million, three hundred thirty-one thousand, nine hundred eighty-two".