21220302 has 48 divisors (see below), whose sum is σ = 45701712. Its totient is φ = 6566400.

The previous prime is 21220261. The next prime is 21220313. The reversal of 21220302 is 20302212.

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, 210052 + ... + 210152.

It is an arithmetic number, because the mean of its divisors is an integer number (952119).

Almost surely, 2^21220302 is an apocalyptic number.

21220302 is an abundant number, since it is smaller than the sum of its proper divisors (24481410).

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

21220302 is a wasteful number, since it uses less digits than its factorization.

21220302 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 241 (or 222 counting only the distinct ones).

The product of its (nonzero) digits is 48, while the sum is 12.

The square root of 21220302 is about 4606.5499020417. The cubic root of 21220302 is about 276.8538199195.

Adding to 21220302 its reverse (20302212), we get a palindrome (41522514).

The spelling of 21220302 in words is "twenty-one million, two hundred twenty thousand, three hundred two".