21401444006 has 4 divisors (see below), whose sum is σ = 32102166012. Its totient is φ = 10700722002.

The previous prime is 21401443969. The next prime is 21401444011. The reversal of 21401444006 is 60044410412.

It is a semiprime because it is the product of two primes.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5350361000 + ... + 5350361003.

It is an arithmetic number, because the mean of its divisors is an integer number (8025541503).

Almost surely, 2^21401444006 is an apocalyptic number.

21401444006 is a deficient number, since it is larger than the sum of its proper divisors (10700722006).

21401444006 is a wasteful number, since it uses less digits than its factorization.

21401444006 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10700722005.

The product of its (nonzero) digits is 3072, while the sum is 26.

Adding to 21401444006 its reverse (60044410412), we get a palindrome (81445854418).

The spelling of 21401444006 in words is "twenty-one billion, four hundred one million, four hundred forty-four thousand, six".