21226953 has 16 divisors (see below), whose sum is σ = 32219136. Its totient is φ = 12305040.

The previous prime is 21226951. The next prime is 21226969. The reversal of 21226953 is 35962212.

It is not a de Polignac number, because 21226953 - 2¹ = 21226951 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 21226953.

It is not an unprimeable number, because it can be changed into a prime (21226951) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 13225 + ... + 14742.

It is an arithmetic number, because the mean of its divisors is an integer number (2013696).

Almost surely, 2^21226953 is an apocalyptic number.

21226953 is a gapful number since it is divisible by the number (23) formed by its first and last digit.

It is an amenable number.

21226953 is a deficient number, since it is larger than the sum of its proper divisors (10992183).

21226953 is a wasteful number, since it uses less digits than its factorization.

21226953 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28004.

The product of its digits is 6480, while the sum is 30.

The square root of 21226953 is about 4607.2717523498. The cubic root of 21226953 is about 276.8827413177.

The spelling of 21226953 in words is "twenty-one million, two hundred twenty-six thousand, nine hundred fifty-three".