21212201202202 has 16 divisors (see below), whose sum is σ = 33692773124160. Its totient is φ = 9981380772288.

The previous prime is 21212201202193. The next prime is 21212201202209. The reversal of 21212201202202 is 20220210221212.

It is a self number, because there is not a number n which added to its sum of digits gives 21212201202202.

It is not an unprimeable number, because it can be changed into a prime (21212201202209) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 25571952 + ... + 26388427.

It is an arithmetic number, because the mean of its divisors is an integer number (2105798320260).

Almost surely, 2^{21212201202202} is an apocalyptic number.

21212201202202 is a deficient number, since it is larger than the sum of its proper divisors (12480571921958).

21212201202202 is a wasteful number, since it uses less digits than its factorization.

21212201202202 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 51972405.

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

Adding to 21212201202202 its reverse (20220210221212), we get a palindrome (41432411423414).

The spelling of 21212201202202 in words is "twenty-one trillion, two hundred twelve billion, two hundred one million, two hundred two thousand, two hundred two".