21274848 has 144 divisors (see below), whose sum is σ = 70682976. Its totient is φ = 5944320.

The previous prime is 21274831. The next prime is 21274861. The reversal of 21274848 is 84847212.

It is a tau number, because it is divible by the number of its divisors (144).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a nude number because it is divisible by every one of its digits.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 122890 + ... + 123062.

It is an arithmetic number, because the mean of its divisors is an integer number (490854).

Almost surely, 2^21274848 is an apocalyptic number.

21274848 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 21274848, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (35341488).

21274848 is an abundant number, since it is smaller than the sum of its proper divisors (49408128).

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

21274848 is a wasteful number, since it uses less digits than its factorization.

21274848 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 257 (or 246 counting only the distinct ones).

The product of its digits is 28672, while the sum is 36.

The square root of 21274848 is about 4612.4665852448. The cubic root of 21274848 is about 277.0908311210.

It can be divided in two parts, 21274 and 848, that added together give a palindrome (22122).

The spelling of 21274848 in words is "twenty-one million, two hundred seventy-four thousand, eight hundred forty-eight".