21827662646 has 16 divisors (see below), whose sum is σ = 32990821776. Its totient is φ = 10831002336.

The previous prime is 21827662627. The next prime is 21827662663. The reversal of 21827662646 is 64626672812.

It is a junction number, because it is equal to n+sod(n) for n = 21827662594 and 21827662603.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 86645 + ... + 226191.

It is an arithmetic number, because the mean of its divisors is an integer number (2061926361).

Almost surely, 2^21827662646 is an apocalyptic number.

21827662646 is a deficient number, since it is larger than the sum of its proper divisors (11163159130).

21827662646 is a wasteful number, since it uses less digits than its factorization.

21827662646 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 140143.

The product of its digits is 2322432, while the sum is 50.

The spelling of 21827662646 in words is "twenty-one billion, eight hundred twenty-seven million, six hundred sixty-two thousand, six hundred forty-six".