21767749481 has 8 divisors (see below), whose sum is σ = 21893328000. Its totient is φ = 21642215440.

The previous prime is 21767749459. The next prime is 21767749483. The reversal of 21767749481 is 18494776712.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 21767749481 - 2³⁰ = 20694007657 is a prime.

It is a super-2 number, since 2×21767749481² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21767749483) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1927391 + ... + 1938651.

It is an arithmetic number, because the mean of its divisors is an integer number (2736666000).

Almost surely, 2^21767749481 is an apocalyptic number.

It is an amenable number.

21767749481 is a deficient number, since it is larger than the sum of its proper divisors (125578519).

21767749481 is a wasteful number, since it uses less digits than its factorization.

21767749481 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22239.

The product of its digits is 4741632, while the sum is 56.

The spelling of 21767749481 in words is "twenty-one billion, seven hundred sixty-seven million, seven hundred forty-nine thousand, four hundred eighty-one".