21048340 has 12 divisors (see below), whose sum is σ = 44201556. Its totient is φ = 8419328.

The previous prime is 21048323. The next prime is 21048341. The reversal of 21048340 is 4384012.

It can be written as a sum of positive squares in 2 ways, for example, as 3104644 + 17943696 = 1762^2 + 4236^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21048341) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 526189 + ... + 526228.

It is an arithmetic number, because the mean of its divisors is an integer number (3683463).

Almost surely, 2^21048340 is an apocalyptic number.

21048340 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21048340 is an abundant number, since it is smaller than the sum of its proper divisors (23153216).

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

21048340 is a wasteful number, since it uses less digits than its factorization.

21048340 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1052426 (or 1052424 counting only the distinct ones).

The product of its (nonzero) digits is 768, while the sum is 22.

The square root of 21048340 is about 4587.8469896020. The cubic root of 21048340 is about 276.1039481034.

The spelling of 21048340 in words is "twenty-one million, forty-eight thousand, three hundred forty".