21746918488 has 8 divisors (see below), whose sum is σ = 40775472180. Its totient is φ = 10873459240.

The previous prime is 21746918467. The next prime is 21746918507. The reversal of 21746918488 is 88481964712.

It is a tau number, because it is divible by the number of its divisors (8).

It is a super-2 number, since 2×21746918488² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1359182398 + ... + 1359182413.

Almost surely, 2^21746918488 is an apocalyptic number.

It is an amenable number.

21746918488 is a deficient number, since it is larger than the sum of its proper divisors (19028553692).

21746918488 is a wasteful number, since it uses less digits than its factorization.

21746918488 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2718364817 (or 2718364813 counting only the distinct ones).

The product of its digits is 6193152, while the sum is 58.

The spelling of 21746918488 in words is "twenty-one billion, seven hundred forty-six million, nine hundred eighteen thousand, four hundred eighty-eight".