21054726 has 72 divisors (see below), whose sum is σ = 57347472. Its totient is φ = 5464800.

The previous prime is 21054703. The next prime is 21054757. The reversal of 21054726 is 62745012.

It is a hoax number, since the sum of its digits (27) coincides with the sum of the digits of its distinct prime factors.

It is a self number, because there is not a number n which added to its sum of digits gives 21054726.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 14556 + ... + 15936.

Almost surely, 2^21054726 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21054726, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (28673736).

21054726 is an abundant number, since it is smaller than the sum of its proper divisors (36292746).

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

21054726 is a wasteful number, since it uses less digits than its factorization.

21054726 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1418 (or 1404 counting only the distinct ones).

The product of its (nonzero) digits is 3360, while the sum is 27.

The square root of 21054726 is about 4588.5429059779. The cubic root of 21054726 is about 276.1318683024.

Adding to 21054726 its reverse (62745012), we get a palindrome (83799738).

The spelling of 21054726 in words is "twenty-one million, fifty-four thousand, seven hundred twenty-six".