21101212001201 has 16 divisors (see below), whose sum is σ = 21645535454208. Its totient is φ = 20564425224000.

The previous prime is 21101212001167. The next prime is 21101212001239. The reversal of 21101212001201 is 10210021210112.

It is a cyclic number.

It is not a de Polignac number, because 21101212001201 - 2¹⁰ = 21101212000177 is a prime.

It is a super-2 number, since 2×21101212001201² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21101212601201) 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, 1995680 + ... + 6795966.

It is an arithmetic number, because the mean of its divisors is an integer number (1352845965888).

Almost surely, 2^{21101212001201} is an apocalyptic number.

It is an amenable number.

21101212001201 is a deficient number, since it is larger than the sum of its proper divisors (544323453007).

21101212001201 is a wasteful number, since it uses less digits than its factorization.

21101212001201 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4801072.

The product of its (nonzero) digits is 16, while the sum is 14.

Adding to 21101212001201 its reverse (10210021210112), we get a palindrome (31311233211313).

The spelling of 21101212001201 in words is "twenty-one trillion, one hundred one billion, two hundred twelve million, one thousand, two hundred one".