21774340944 has 100 divisors (see below), whose sum is σ = 63227696224. Its totient is φ = 7234339392.

The previous prime is 21774340943. The next prime is 21774340963. The reversal of 21774340944 is 44904347712.

21774340944 is a `hidden beast` number, since 2 + 177 + 434 + 0 + 9 + 44 = 666.

It is a super-2 number, since 2×21774340944² (a number of 21 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 21774340944.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21774340943) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 370509 + ... + 425235.

Almost surely, 2^21774340944 is an apocalyptic number.

21774340944 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21774340944, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (31613848112).

21774340944 is an abundant number, since it is smaller than the sum of its proper divisors (41453355280).

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

21774340944 is a wasteful number, since it uses less digits than its factorization.

21774340944 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 55054 (or 55039 counting only the distinct ones).

The product of its (nonzero) digits is 677376, while the sum is 45.

The spelling of 21774340944 in words is "twenty-one billion, seven hundred seventy-four million, three hundred forty thousand, nine hundred forty-four".