21144423682 has 24 divisors (see below), whose sum is σ = 32886172800. Its totient is φ = 10195800048.

The previous prime is 21144423649. The next prime is 21144423697. The reversal of 21144423682 is 28632444112.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1538919 + ... + 1552597.

It is an arithmetic number, because the mean of its divisors is an integer number (1370257200).

Almost surely, 2^21144423682 is an apocalyptic number.

21144423682 is a deficient number, since it is larger than the sum of its proper divisors (11741749118).

21144423682 is a wasteful number, since it uses less digits than its factorization.

21144423682 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14658 (or 14629 counting only the distinct ones).

The product of its digits is 73728, while the sum is 37.

Adding to 21144423682 its reverse (28632444112), we get a palindrome (49776867794).

The spelling of 21144423682 in words is "twenty-one billion, one hundred forty-four million, four hundred twenty-three thousand, six hundred eighty-two".