21751627063 has 4 divisors (see below), whose sum is σ = 22896449560. Its totient is φ = 20606804568.

The previous prime is 21751627061. The next prime is 21751627067. The reversal of 21751627063 is 36072615712.

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

It is a cyclic number.

It is not a de Polignac number, because 21751627063 - 2¹ = 21751627061 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21751627061) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 572411220 + ... + 572411257.

It is an arithmetic number, because the mean of its divisors is an integer number (5724112390).

Almost surely, 2^21751627063 is an apocalyptic number.

21751627063 is a deficient number, since it is larger than the sum of its proper divisors (1144822497).

21751627063 is a wasteful number, since it uses less digits than its factorization.

21751627063 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1144822496.

The product of its (nonzero) digits is 105840, while the sum is 40.

The spelling of 21751627063 in words is "twenty-one billion, seven hundred fifty-one million, six hundred twenty-seven thousand, sixty-three".