21210102210021 has 16 divisors (see below), whose sum is σ = 28291441859136. Its totient is φ = 14134416248576.

The previous prime is 21210102210001. The next prime is 21210102210047. The reversal of 21210102210021 is 12001220101212.

It is a cyclic number.

It is not a de Polignac number, because 21210102210021 - 2¹³ = 21210102201829 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21210102210001) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 100267261 + ... + 100478573.

It is an arithmetic number, because the mean of its divisors is an integer number (1768215116196).

Almost surely, 2^{21210102210021} is an apocalyptic number.

It is an amenable number.

21210102210021 is a deficient number, since it is larger than the sum of its proper divisors (7081339649115).

21210102210021 is a wasteful number, since it uses less digits than its factorization.

21210102210021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 224532.

The product of its (nonzero) digits is 32, while the sum is 15.

Adding to 21210102210021 its reverse (12001220101212), we get a palindrome (33211322311233).

The spelling of 21210102210021 in words is "twenty-one trillion, two hundred ten billion, one hundred two million, two hundred ten thousand, twenty-one".