21349848 has 64 divisors (see below), whose sum is σ = 58917600. Its totient is φ = 6405120.

The previous prime is 21349847. The next prime is 21349849. The reversal of 21349848 is 84894312.

It is an interprime number because it is at equal distance from previous prime (21349847) and next prime (21349849).

It is a Harshad number since it is a multiple of its sum of digits (39).

Its product of digits (55296) is a multiple of the sum of its prime divisors (1728).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21349847) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 11958 + ... + 13626.

Almost surely, 2^21349848 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21349848, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (29458800).

21349848 is an abundant number, since it is smaller than the sum of its proper divisors (37567752).

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

21349848 is a wasteful number, since it uses less digits than its factorization.

21349848 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1732 (or 1728 counting only the distinct ones).

The product of its digits is 55296, while the sum is 39.

The square root of 21349848 is about 4620.5895727710. The cubic root of 21349848 is about 277.4160577206.

The spelling of 21349848 in words is "twenty-one million, three hundred forty-nine thousand, eight hundred forty-eight".