21147762384 has 60 divisors (see below), whose sum is σ = 67639274976. Its totient is φ = 6042217536.

The previous prime is 21147762347. The next prime is 21147762397. The reversal of 21147762384 is 48326774112.

21147762384 is a `hidden beast` number, since 2 + 1 + 14 + 7 + 7 + 623 + 8 + 4 = 666.

It is a nude number because it is divisible by every one of its digits.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 10488954 + ... + 10490969.

Almost surely, 2^21147762384 is an apocalyptic number.

21147762384 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

21147762384 is an abundant number, since it is smaller than the sum of its proper divisors (46491512592).

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

21147762384 is a wasteful number, since it uses less digits than its factorization.

21147762384 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20979944 (or 20979935 counting only the distinct ones).

The product of its digits is 451584, while the sum is 45.

The spelling of 21147762384 in words is "twenty-one billion, one hundred forty-seven million, seven hundred sixty-two thousand, three hundred eighty-four".