21421751627 has 16 divisors (see below), whose sum is σ = 22278775680. Its totient is φ = 20582016000.

The previous prime is 21421751591. The next prime is 21421751633. The reversal of 21421751627 is 72615712412.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 21421751627 - 2¹⁴ = 21421735243 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21421751327) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1290593 + ... + 1307085.

It is an arithmetic number, because the mean of its divisors is an integer number (1392423480).

Almost surely, 2^21421751627 is an apocalyptic number.

21421751627 is a deficient number, since it is larger than the sum of its proper divisors (857024053).

21421751627 is a wasteful number, since it uses less digits than its factorization.

21421751627 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17014.

The product of its digits is 47040, while the sum is 38.

The spelling of 21421751627 in words is "twenty-one billion, four hundred twenty-one million, seven hundred fifty-one thousand, six hundred twenty-seven".