21212021200210 has 16 divisors (see below), whose sum is σ = 38575263297816. Its totient is φ = 8397336227328.

The previous prime is 21212021200163. The next prime is 21212021200219. The reversal of 21212021200210 is 1200212021212.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 17448774271929 + 3763246928281 = 4177173^2 + 1939909^2 .

It is not an unprimeable number, because it can be changed into a prime (21212021200219) 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, 10934030577 + ... + 10934032516.

Almost surely, 2^{21212021200210} is an apocalyptic number.

21212021200210 is a deficient number, since it is larger than the sum of its proper divisors (17363242097606).

21212021200210 is a wasteful number, since it uses less digits than its factorization.

21212021200210 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21868063197.

The product of its (nonzero) digits is 64, while the sum is 16.

Adding to 21212021200210 its reverse (1200212021212), we get a palindrome (22412233221422).

The spelling of 21212021200210 in words is "twenty-one trillion, two hundred twelve billion, twenty-one million, two hundred thousand, two hundred ten".