21054826 has 8 divisors (see below), whose sum is σ = 34011684. Its totient is φ = 9717600.

The previous prime is 21054811. The next prime is 21054827. The reversal of 21054826 is 62845012.

It can be written as a sum of positive squares in 2 ways, for example, as 20566225 + 488601 = 4535^2 + 699^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a junction number, because it is equal to n+sod(n) for n = 21054794 and 21054803.

It is not an unprimeable number, because it can be changed into a prime (21054827) 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, 404875 + ... + 404926.

Almost surely, 2^21054826 is an apocalyptic number.

21054826 is a gapful number since it is divisible by the number (26) formed by its first and last digit.

21054826 is a deficient number, since it is larger than the sum of its proper divisors (12956858).

21054826 is a wasteful number, since it uses less digits than its factorization.

21054826 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 809816.

The product of its (nonzero) digits is 3840, while the sum is 28.

The square root of 21054826 is about 4588.5538026703. The cubic root of 21054826 is about 276.1323054670.

Adding to 21054826 its reverse (62845012), we get a palindrome (83899838).

The spelling of 21054826 in words is "twenty-one million, fifty-four thousand, eight hundred twenty-six".