21774365548 has 48 divisors (see below), whose sum is σ = 41296227840. Its totient is φ = 9986243904.

The previous prime is 21774365461. The next prime is 21774365549. The reversal of 21774365548 is 84556347712.

It is a Harshad number since it is a multiple of its sum of digits (52).

It is a junction number, because it is equal to n+sod(n) for n = 21774365495 and 21774365504.

It is not an unprimeable number, because it can be changed into a prime (21774365549) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 6796515 + ... + 6799717.

It is an arithmetic number, because the mean of its divisors is an integer number (860338080).

Almost surely, 2^21774365548 is an apocalyptic number.

It is an amenable number.

21774365548 is a deficient number, since it is larger than the sum of its proper divisors (19521862292).

21774365548 is a wasteful number, since it uses less digits than its factorization.

21774365548 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4006 (or 4004 counting only the distinct ones).

The product of its digits is 5644800, while the sum is 52.

The spelling of 21774365548 in words is "twenty-one billion, seven hundred seventy-four million, three hundred sixty-five thousand, five hundred forty-eight".