21212020201202 has 4 divisors (see below), whose sum is σ = 31818030301806. Its totient is φ = 10606010100600.

The previous prime is 21212020201193. The next prime is 21212020201223. The reversal of 21212020201202 is 20210202021212.

It is a happy number.

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., 10965164654161 + 10246855547041 = 3311369^2 + 3201071^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5303005050299 + ... + 5303005050302.

Almost surely, 2^{21212020201202} is an apocalyptic number.

21212020201202 is a deficient number, since it is larger than the sum of its proper divisors (10606010100604).

21212020201202 is a wasteful number, since it uses less digits than its factorization.

21212020201202 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10606010100603.

The product of its (nonzero) digits is 128, while the sum is 17.

Adding to 21212020201202 its reverse (20210202021212), we get a palindrome (41422222222414).

The spelling of 21212020201202 in words is "twenty-one trillion, two hundred twelve billion, twenty million, two hundred one thousand, two hundred two".