21181847088 has 20 divisors (see below), whose sum is σ = 54719771768. Its totient is φ = 7060615680.

The previous prime is 21181847081. The next prime is 21181847101. The reversal of 21181847088 is 88074818112.

It is a Harshad number since it is a multiple of its sum of digits (48), and also a Moran number because the ratio is a prime number: 441288481 = 21181847088 / (2 + 1 + 1 + 8 + 1 + 8 + 4 + 7 + 0 + 8 + 8).

It is not an unprimeable number, because it can be changed into a prime (21181847081) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 220644193 + ... + 220644288.

Almost surely, 2^21181847088 is an apocalyptic number.

It is an amenable number.

21181847088 is an abundant number, since it is smaller than the sum of its proper divisors (33537924680).

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

21181847088 is a wasteful number, since it uses less digits than its factorization.

21181847088 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 441288492 (or 441288486 counting only the distinct ones).

The product of its (nonzero) digits is 229376, while the sum is 48.

The spelling of 21181847088 in words is "twenty-one billion, one hundred eighty-one million, eight hundred forty-seven thousand, eighty-eight".