21869848 has 64 divisors (see below), whose sum is σ = 55077120. Its totient is φ = 7862400.

The previous prime is 21869839. The next prime is 21869879. The reversal of 21869848 is 84896812.

It is a junction number, because it is equal to n+sod(n) for n = 21869798 and 21869807.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 6643 + ... + 9373.

It is an arithmetic number, because the mean of its divisors is an integer number (860580).

Almost surely, 2^21869848 is an apocalyptic number.

21869848 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 21869848, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (27538560).

21869848 is an abundant number, since it is smaller than the sum of its proper divisors (33207272).

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

21869848 is a wasteful number, since it uses less digits than its factorization.

21869848 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2768 (or 2764 counting only the distinct ones).

The product of its digits is 221184, while the sum is 46.

The square root of 21869848 is about 4676.5209290668. The cubic root of 21869848 is about 279.6502776615.

The spelling of 21869848 in words is "twenty-one million, eight hundred sixty-nine thousand, eight hundred forty-eight".