21212001111201 has 64 divisors (see below), whose sum is σ = 29684759150592. Its totient is φ = 13461940800000.

The previous prime is 21212001111187. The next prime is 21212001111211. The reversal of 21212001111201 is 10211110021212.

It is a happy number.

It is not a de Polignac number, because 21212001111201 - 2¹¹ = 21212001109153 is a prime.

It is a super-2 number, since 2×21212001111201² (a number of 27 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (21212001111211) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 357333415 + ... + 357392771.

It is an arithmetic number, because the mean of its divisors is an integer number (463824361728).

Almost surely, 2^{21212001111201} is an apocalyptic number.

It is an amenable number.

21212001111201 is a deficient number, since it is larger than the sum of its proper divisors (8472758039391).

21212001111201 is a wasteful number, since it uses less digits than its factorization.

21212001111201 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 59894.

The product of its (nonzero) digits is 16, while the sum is 15.

Adding to 21212001111201 its reverse (10211110021212), we get a palindrome (31423111132413).

It can be divided in two parts, 212120011 and 11201, that added together give a palindrome (212131212).

The spelling of 21212001111201 in words is "twenty-one trillion, two hundred twelve billion, one million, one hundred eleven thousand, two hundred one".