21210101200202 has 4 divisors (see below), whose sum is σ = 31815151800306. Its totient is φ = 10605050600100.

The previous prime is 21210101200139. The next prime is 21210101200207. The reversal of 21210101200202 is 20200210101212.

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., 15386861366881 + 5823239833321 = 3922609^2 + 2413139^2 .

It is not an unprimeable number, because it can be changed into a prime (21210101200207) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5302525300049 + ... + 5302525300052.

Almost surely, 2^{21210101200202} is an apocalyptic number.

21210101200202 is a deficient number, since it is larger than the sum of its proper divisors (10605050600104).

21210101200202 is a wasteful number, since it uses less digits than its factorization.

21210101200202 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10605050600103.

The product of its (nonzero) digits is 32, while the sum is 14.

Adding to 21210101200202 its reverse (20200210101212), we get a palindrome (41410311301414).

The spelling of 21210101200202 in words is "twenty-one trillion, two hundred ten billion, one hundred one million, two hundred thousand, two hundred two".