21426048 has 96 divisors (see below), whose sum is σ = 70490160. Its totient is φ = 6119424.

The previous prime is 21426047. The next prime is 21426049. The reversal of 21426048 is 84062412.

It is an interprime number because it is at equal distance from previous prime (21426047) and next prime (21426049).

It is a tau number, because it is divible by the number of its divisors (96).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21426047) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 6736 + ... + 9392.

Almost surely, 2^21426048 is an apocalyptic number.

21426048 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 21426048, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (35245080).

21426048 is an abundant number, since it is smaller than the sum of its proper divisors (49064112).

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

21426048 is a wasteful number, since it uses less digits than its factorization.

21426048 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2684 (or 2669 counting only the distinct ones).

The product of its (nonzero) digits is 3072, while the sum is 27.

The square root of 21426048 is about 4628.8279294007. The cubic root of 21426048 is about 277.7457088430.

It can be divided in two parts, 214 and 26048, that added together give a palindrome (26262).

The spelling of 21426048 in words is "twenty-one million, four hundred twenty-six thousand, forty-eight".