21767749484 has 24 divisors (see below), whose sum is σ = 43437004128. Its totient is φ = 9455673600.

The previous prime is 21767749483. The next prime is 21767749489. The reversal of 21767749484 is 48494776712.

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, 12311192 + ... + 12312959.

It is an arithmetic number, because the mean of its divisors is an integer number (1809875172).

Almost surely, 2^21767749484 is an apocalyptic number.

It is an amenable number.

21767749484 is a deficient number, since it is larger than the sum of its proper divisors (21669254644).

21767749484 is a wasteful number, since it uses less digits than its factorization.

21767749484 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24624185 (or 24624183 counting only the distinct ones).

The product of its digits is 18966528, while the sum is 59.

The spelling of 21767749484 in words is "twenty-one billion, seven hundred sixty-seven million, seven hundred forty-nine thousand, four hundred eighty-four".