21669390848 has 320 divisors, whose sum is σ = 53852553216. Its totient is φ = 8515584000.

The previous prime is 21669390839. The next prime is 21669390851. The reversal of 21669390848 is 84809396612.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (56).

It is a junction number, because it is equal to n+sod(n) for n = 21669390793 and 21669390802.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 305202653 + ... + 305202723.

Almost surely, 2^21669390848 is an apocalyptic number.

21669390848 is a gapful number since it is divisible by the number (28) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21669390848, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (26926276608).

21669390848 is an abundant number, since it is smaller than the sum of its proper divisors (32183162368).

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

21669390848 is an equidigital number, since it uses as much as digits as its factorization.

21669390848 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 235 (or 219 counting only the distinct ones).

The product of its (nonzero) digits is 4478976, while the sum is 56.

The spelling of 21669390848 in words is "twenty-one billion, six hundred sixty-nine million, three hundred ninety thousand, eight hundred forty-eight".