21202212210202 has 4 divisors (see below), whose sum is σ = 31803318315306. Its totient is φ = 10601106105100.

The previous prime is 21202212210187. The next prime is 21202212210211. The reversal of 21202212210202 is 20201221220212.

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., 20602239582961 + 599972627241 = 4538969^2 + 774579^2 .

It is a super-3 number, since 3×21202212210202³ (a number of 41 digits) contains 333 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 21202212210202.

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, 5300553052549 + ... + 5300553052552.

Almost surely, 2^{21202212210202} is an apocalyptic number.

21202212210202 is a deficient number, since it is larger than the sum of its proper divisors (10601106105104).

21202212210202 is a wasteful number, since it uses less digits than its factorization.

21202212210202 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10601106105103.

The product of its (nonzero) digits is 256, while the sum is 19.

Adding to 21202212210202 its reverse (20201221220212), we get a palindrome (41403433430414).

The spelling of 21202212210202 in words is "twenty-one trillion, two hundred two billion, two hundred twelve million, two hundred ten thousand, two hundred two".