21774927846 has 32 divisors (see below), whose sum is σ = 52390805760. Its totient is φ = 5893965216.

The previous prime is 21774927817. The next prime is 21774927851. The reversal of 21774927846 is 64872947712.

It is a Harshad number since it is a multiple of its sum of digits (57).

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 15 ways as a sum of consecutive naturals, for example, 13642641 + ... + 13644236.

It is an arithmetic number, because the mean of its divisors is an integer number (1637212680).

Almost surely, 2^21774927846 is an apocalyptic number.

21774927846 is an abundant number, since it is smaller than the sum of its proper divisors (30615877914).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21774927846 is a wasteful number, since it uses less digits than its factorization.

21774927846 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27286908.

The product of its digits is 9483264, while the sum is 57.

The spelling of 21774927846 in words is "twenty-one billion, seven hundred seventy-four million, nine hundred twenty-seven thousand, eight hundred forty-six".