21201210212102 has 16 divisors (see below), whose sum is σ = 34555452979200. Its totient is φ = 9718721149320.

The previous prime is 21201210212057. The next prime is 21201210212111. The reversal of 21201210212102 is 20121201210212.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8998814702 + ... + 8998817057.

It is an arithmetic number, because the mean of its divisors is an integer number (2159715811200).

Almost surely, 2^{21201210212102} is an apocalyptic number.

21201210212102 is a deficient number, since it is larger than the sum of its proper divisors (13354242767098).

21201210212102 is a wasteful number, since it uses less digits than its factorization.

21201210212102 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17997631811.

The product of its (nonzero) digits is 64, while the sum is 17.

Adding to 21201210212102 its reverse (20121201210212), we get a palindrome (41322411422314).

The spelling of 21201210212102 in words is "twenty-one trillion, two hundred one billion, two hundred ten million, two hundred twelve thousand, one hundred two".