21747674760 has 128 divisors (see below), whose sum is σ = 74662145280. Its totient is φ = 4964318208.

The previous prime is 21747674737. The next prime is 21747674761. The reversal of 21747674760 is 6747674712.

It is a super-2 number, since 2×21747674760² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (21747674761) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 632574 + ... + 666066.

It is an arithmetic number, because the mean of its divisors is an integer number (583298010).

Almost surely, 2^21747674760 is an apocalyptic number.

21747674760 is a gapful number since it is divisible by the number (20) 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 21747674760, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (37331072640).

21747674760 is an abundant number, since it is smaller than the sum of its proper divisors (52914470520).

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

21747674760 is a wasteful number, since it uses less digits than its factorization.

21747674760 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 34287 (or 34283 counting only the distinct ones).

The product of its (nonzero) digits is 2765952, while the sum is 51.

The spelling of 21747674760 in words is "twenty-one billion, seven hundred forty-seven million, six hundred seventy-four thousand, seven hundred sixty".