21020101020202 has 4 divisors (see below), whose sum is σ = 31530151530306. Its totient is φ = 10510050510100.

The previous prime is 21020101020077. The next prime is 21020101020209. The reversal of 21020101020202 is 20202010102012.

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., 17982187972681 + 3037913047521 = 4240541^2 + 1742961^2 .

It is a super-2 number, since 2×21020101020202² (a number of 27 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (21020101020209) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5255025255049 + ... + 5255025255052.

Almost surely, 2^{21020101020202} is an apocalyptic number.

21020101020202 is a deficient number, since it is larger than the sum of its proper divisors (10510050510104).

21020101020202 is a wasteful number, since it uses less digits than its factorization.

21020101020202 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10510050510103.

The product of its (nonzero) digits is 32, while the sum is 13.

Adding to 21020101020202 its reverse (20202010102012), we get a palindrome (41222111122214).

The spelling of 21020101020202 in words is "twenty-one trillion, twenty billion, one hundred one million, twenty thousand, two hundred two".