21226302 has 48 divisors (see below), whose sum is σ = 49432032. Its totient is φ = 6558720.

The previous prime is 21226291. The next prime is 21226321. The reversal of 21226302 is 20362212.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 21238 + ... + 22214.

It is an arithmetic number, because the mean of its divisors is an integer number (1029834).

Almost surely, 2^21226302 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21226302, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (24716016).

21226302 is an abundant number, since it is smaller than the sum of its proper divisors (28205730).

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

21226302 is a wasteful number, since it uses less digits than its factorization.

21226302 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1073 (or 1070 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 18.

The square root of 21226302 is about 4607.2011026219. The cubic root of 21226302 is about 276.8799107575.

Adding to 21226302 its reverse (20362212), we get a palindrome (41588514).

It can be divided in two parts, 21226 and 302, that added together give a triangular number (21528 = T₂₀₇).

The spelling of 21226302 in words is "twenty-one million, two hundred twenty-six thousand, three hundred two".