21210230203202 has 16 divisors (see below), whose sum is σ = 32252247245112. Its totient is φ = 10459490808960.

The previous prime is 21210230203147. The next prime is 21210230203229. The reversal of 21210230203202 is 20230203201212.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 21176185894081 + 34044309121 = 4601759^2 + 184511^2 .

It is a super-2 number, since 2×21210230203202² (a number of 27 digits) contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1999688 + ... + 6813164.

Almost surely, 2^{21210230203202} is an apocalyptic number.

21210230203202 is a deficient number, since it is larger than the sum of its proper divisors (11042017041910).

21210230203202 is a wasteful number, since it uses less digits than its factorization.

21210230203202 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4843733.

The product of its (nonzero) digits is 576, while the sum is 20.

Adding to 21210230203202 its reverse (20230203201212), we get a palindrome (41440433404414).

The spelling of 21210230203202 in words is "twenty-one trillion, two hundred ten billion, two hundred thirty million, two hundred three thousand, two hundred two".