21011026 has 8 divisors (see below), whose sum is σ = 31710384. Its totient is φ = 10440900.

The previous prime is 21011009. The next prime is 21011033. The reversal of 21011026 is 62011012.

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 = 21010997 and 21011015.

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, 31900 + ... + 32551.

It is an arithmetic number, because the mean of its divisors is an integer number (3963798).

Almost surely, 2^21011026 is an apocalyptic number.

21011026 is a deficient number, since it is larger than the sum of its proper divisors (10699358).

21011026 is a wasteful number, since it uses less digits than its factorization.

21011026 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 64616.

The product of its (nonzero) digits is 24, while the sum is 13.

The square root of 21011026 is about 4583.7785723135. The cubic root of 21011026 is about 275.9406947422.

Adding to 21011026 its reverse (62011012), we get a palindrome (83022038).

It can be divided in two parts, 210 and 11026, that added together give a square (11236 = 106²).

The spelling of 21011026 in words is "twenty-one million, eleven thousand, twenty-six".