21321202 has 16 divisors (see below), whose sum is σ = 36717120. Its totient is φ = 9096048.

The previous prime is 21321199. The next prime is 21321203. The reversal of 21321202 is 20212312.

It is not an unprimeable number, because it can be changed into a prime (21321203) 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 7 ways as a sum of consecutive naturals, for example, 177 + ... + 6532.

It is an arithmetic number, because the mean of its divisors is an integer number (2294820).

Almost surely, 2^21321202 is an apocalyptic number.

21321202 is a deficient number, since it is larger than the sum of its proper divisors (15395918).

21321202 is a wasteful number, since it uses less digits than its factorization.

21321202 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6945.

The product of its (nonzero) digits is 48, while the sum is 13.

The square root of 21321202 is about 4617.4887114101. The cubic root of 21321202 is about 277.2919285425.

Adding to 21321202 its reverse (20212312), we get a palindrome (41533514).

The spelling of 21321202 in words is "twenty-one million, three hundred twenty-one thousand, two hundred two".