21201010202 has 4 divisors (see below), whose sum is σ = 31801515306. Its totient is φ = 10600505100.

The previous prime is 21201010189. The next prime is 21201010213. The reversal of 21201010202 is 20201010212.

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., 18232830841 + 2968179361 = 135029^2 + 54481^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5300252549 + ... + 5300252552.

Almost surely, 2^21201010202 is an apocalyptic number.

21201010202 is a deficient number, since it is larger than the sum of its proper divisors (10600505104).

21201010202 is a wasteful number, since it uses less digits than its factorization.

21201010202 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10600505103.

The product of its (nonzero) digits is 16, while the sum is 11.

Adding to 21201010202 its reverse (20201010212), we get a palindrome (41402020414).

The spelling of 21201010202 in words is "twenty-one billion, two hundred one million, ten thousand, two hundred two".