21774597152 has 192 divisors, whose sum is σ = 57281624064. Its totient is φ = 7887114240.

The previous prime is 21774597137. The next prime is 21774597179. The reversal of 21774597152 is 25179547712.

It is a super-2 number, since 2×21774597152² (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 21774597152.

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 31 ways as a sum of consecutive naturals, for example, 3473573 + ... + 3479835.

It is an arithmetic number, because the mean of its divisors is an integer number (298341792).

Almost surely, 2^21774597152 is an apocalyptic number.

21774597152 is a gapful number since it is divisible by the number (22) 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 21774597152, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (28640812032).

21774597152 is an abundant number, since it is smaller than the sum of its proper divisors (35507026912).

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

21774597152 is a wasteful number, since it uses less digits than its factorization.

21774597152 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6391 (or 6383 counting only the distinct ones).

The product of its digits is 1234800, while the sum is 50.

The spelling of 21774597152 in words is "twenty-one billion, seven hundred seventy-four million, five hundred ninety-seven thousand, one hundred fifty-two".