21021212312101 has 16 divisors (see below), whose sum is σ = 22232165705728. Its totient is φ = 19844764354800.

The previous prime is 21021212312047. The next prime is 21021212312119. The reversal of 21021212312101 is 10121321212012.

It is a cyclic number.

It is not a de Polignac number, because 21021212312101 - 2²³ = 21021203923493 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21021212312141) by changing a digit.

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 15 ways as a sum of consecutive naturals, for example, 8969895 + ... + 11068036.

It is an arithmetic number, because the mean of its divisors is an integer number (1389510356608).

Almost surely, 2^{21021212312101} is an apocalyptic number.

It is an amenable number.

21021212312101 is a deficient number, since it is larger than the sum of its proper divisors (1210953393627).

21021212312101 is a wasteful number, since it uses less digits than its factorization.

21021212312101 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20038792.

The product of its (nonzero) digits is 96, while the sum is 19.

Adding to 21021212312101 its reverse (10121321212012), we get a palindrome (31142533524113).

The spelling of 21021212312101 in words is "twenty-one trillion, twenty-one billion, two hundred twelve million, three hundred twelve thousand, one hundred one".