21048048 has 180 divisors, whose sum is σ = 72588360. Its totient is φ = 5660928.

The previous prime is 21048019. The next prime is 21048061. The reversal of 21048048 is 84084012.

It is a super-2 number, since 2×21048048² = 886040649220608, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 133986 + ... + 134142.

Almost surely, 2^21048048 is an apocalyptic number.

21048048 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 21048048, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (36294180).

21048048 is an abundant number, since it is smaller than the sum of its proper divisors (51540312).

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

21048048 is a wasteful number, since it uses less digits than its factorization.

21048048 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 204 (or 188 counting only the distinct ones).

The product of its (nonzero) digits is 2048, while the sum is 27.

The square root of 21048048 is about 4587.8151662856. The cubic root of 21048048 is about 276.1026713166.

The spelling of 21048048 in words is "twenty-one million, forty-eight thousand, forty-eight".