21647049088 has 48 divisors (see below), whose sum is σ = 50165808300. Its totient is φ = 9277304064.

The previous prime is 21647049037. The next prime is 21647049089. The reversal of 21647049088 is 88094074612.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (49).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21647049089) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1719418 + ... + 1731961.

Almost surely, 2^21647049088 is an apocalyptic number.

21647049088 is a gapful number since it is divisible by the number (28) formed by its first and last digit.

It is an amenable number.

21647049088 is an abundant number, since it is smaller than the sum of its proper divisors (28518759212).

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

21647049088 is an equidigital number, since it uses as much as digits as its factorization.

21647049088 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3451407 (or 3451388 counting only the distinct ones).

The product of its (nonzero) digits is 774144, while the sum is 49.

The spelling of 21647049088 in words is "twenty-one billion, six hundred forty-seven million, forty-nine thousand, eighty-eight".