21225358 has 16 divisors (see below), whose sum is σ = 39694464. Its totient is φ = 8269560.

The previous prime is 21225353. The next prime is 21225397. The reversal of 21225358 is 85352212.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21225353) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 68760 + ... + 69067.

It is an arithmetic number, because the mean of its divisors is an integer number (2480904).

Almost surely, 2^21225358 is an apocalyptic number.

21225358 is a deficient number, since it is larger than the sum of its proper divisors (18469106).

21225358 is a wasteful number, since it uses less digits than its factorization.

21225358 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 137847.

The product of its digits is 4800, while the sum is 28.

The square root of 21225358 is about 4607.0986531656. The cubic root of 21225358 is about 276.8758061249.

The spelling of 21225358 in words is "twenty-one million, two hundred twenty-five thousand, three hundred fifty-eight".