21212002202 has 4 divisors (see below), whose sum is σ = 31818003306. Its totient is φ = 10606001100.

The previous prime is 21212002193. The next prime is 21212002261. The reversal of 21212002202 is 20220021212.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 20110359721 + 1101642481 = 141811^2 + 33191^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5303000549 + ... + 5303000552.

Almost surely, 2^21212002202 is an apocalyptic number.

21212002202 is a deficient number, since it is larger than the sum of its proper divisors (10606001104).

21212002202 is a wasteful number, since it uses less digits than its factorization.

21212002202 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10606001103.

The product of its (nonzero) digits is 64, while the sum is 14.

Adding to 21212002202 its reverse (20220021212), we get a palindrome (41432023414).

The spelling of 21212002202 in words is "twenty-one billion, two hundred twelve million, two thousand, two hundred two".