21210202210012 has 12 divisors (see below), whose sum is σ = 37117922329656. Its totient is φ = 10605081544400.

The previous prime is 21210202209971. The next prime is 21210202210019. The reversal of 21210202210012 is 21001220201212.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21210202210019) 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 in 3 ways as a sum of consecutive naturals, for example, 2297698 + ... + 6906505.

It is an arithmetic number, because the mean of its divisors is an integer number (3093160194138).

Almost surely, 2^{21210202210012} is an apocalyptic number.

It is an amenable number.

21210202210012 is a deficient number, since it is larger than the sum of its proper divisors (15907720119644).

21210202210012 is a wasteful number, since it uses less digits than its factorization.

21210202210012 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9780308 (or 9780306 counting only the distinct ones).

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

Adding to 21210202210012 its reverse (21001220201212), we get a palindrome (42211422411224).

The spelling of 21210202210012 in words is "twenty-one trillion, two hundred ten billion, two hundred two million, two hundred ten thousand, twelve".