21026350 has 24 divisors (see below), whose sum is σ = 41169240. Its totient is φ = 7967520.

The previous prime is 21026333. The next prime is 21026351. The reversal of 21026350 is 5362012.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (19).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21026351) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 10117 + ... + 12016.

It is an arithmetic number, because the mean of its divisors is an integer number (1715385).

Almost surely, 2^21026350 is an apocalyptic number.

21026350 is a deficient number, since it is larger than the sum of its proper divisors (20142890).

21026350 is a wasteful number, since it uses less digits than its factorization.

21026350 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22164 (or 22159 counting only the distinct ones).

The product of its (nonzero) digits is 360, while the sum is 19.

The square root of 21026350 is about 4585.4498143585. The cubic root of 21026350 is about 276.0077625066.

Adding to 21026350 its reverse (5362012), we get a palindrome (26388362).

The spelling of 21026350 in words is "twenty-one million, twenty-six thousand, three hundred fifty".