21060726 has 8 divisors (see below), whose sum is σ = 42121464. Its totient is φ = 7020240.

The previous prime is 21060707. The next prime is 21060731. The reversal of 21060726 is 62706012.

It is a happy number.

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

21060726 is an admirable number.

It is a junction number, because it is equal to n+sod(n) for n = 21060696 and 21060705.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1755055 + ... + 1755066.

It is an arithmetic number, because the mean of its divisors is an integer number (5265183).

Almost surely, 2^21060726 is an apocalyptic number.

21060726 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

21060726 is a wasteful number, since it uses less digits than its factorization.

21060726 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3510126.

The product of its (nonzero) digits is 1008, while the sum is 24.

The square root of 21060726 is about 4589.1966617263. The cubic root of 21060726 is about 276.1580957292.

Adding to 21060726 its reverse (62706012), we get a palindrome (83766738).

The spelling of 21060726 in words is "twenty-one million, sixty thousand, seven hundred twenty-six".