21004440122 has 8 divisors (see below), whose sum is σ = 31533569472. Its totient is φ = 10493250300.

The previous prime is 21004440101. The next prime is 21004440133. The reversal of 21004440122 is 22104440012.

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

It is a junction number, because it is equal to n+sod(n) for n = 21004440094 and 21004440103.

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 3 ways as a sum of consecutive naturals, for example, 4481954 + ... + 4486637.

It is an arithmetic number, because the mean of its divisors is an integer number (3941696184).

Almost surely, 2^21004440122 is an apocalyptic number.

21004440122 is a deficient number, since it is larger than the sum of its proper divisors (10529129350).

21004440122 is a wasteful number, since it uses less digits than its factorization.

21004440122 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8969764.

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

Adding to 21004440122 its reverse (22104440012), we get a palindrome (43108880134).

The spelling of 21004440122 in words is "twenty-one billion, four million, four hundred forty thousand, one hundred twenty-two".