21220202 has 8 divisors (see below), whose sum is σ = 31892736. Its totient is φ = 10589292.

The previous prime is 21220159. The next prime is 21220211. The reversal of 21220202 is 20202212.

It is a sphenic number, since it is the product of 3 distinct primes.

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 9098 + ... + 11189.

It is an arithmetic number, because the mean of its divisors is an integer number (3986592).

Almost surely, 2^21220202 is an apocalyptic number.

21220202 is a deficient number, since it is larger than the sum of its proper divisors (10672534).

21220202 is a wasteful number, since it uses less digits than its factorization.

21220202 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20812.

The product of its (nonzero) digits is 32, while the sum is 11.

The square root of 21220202 is about 4606.5390479187. The cubic root of 21220202 is about 276.8533850305.

Adding to 21220202 its reverse (20202212), we get a palindrome (41422414).

It can be divided in two parts, 212 and 20202, that multiplied together give a palindrome (4282824).

The spelling of 21220202 in words is "twenty-one million, two hundred twenty thousand, two hundred two".