221201212001 has 24 divisors (see below), whose sum is σ = 280741031136. Its totient is φ = 172344318720.

The previous prime is 221201211947. The next prime is 221201212013. The reversal of 221201212001 is 100212102122.

It is not a de Polignac number, because 221201212001 - 2¹⁴ = 221201195617 is a prime.

It is a super-2 number, since 2×221201212001² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (221201217001) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 5924945 + ... + 5962161.

It is an arithmetic number, because the mean of its divisors is an integer number (11697542964).

Almost surely, 2^221201212001 is an apocalyptic number.

It is an amenable number.

221201212001 is a deficient number, since it is larger than the sum of its proper divisors (59539819135).

221201212001 is a wasteful number, since it uses less digits than its factorization.

221201212001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 48269 (or 48262 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 14.

Adding to 221201212001 its reverse (100212102122), we get a palindrome (321413314123).

It can be divided in two parts, 22120121 and 2001, that added together give a palindrome (22122122).

The spelling of 221201212001 in words is "two hundred twenty-one billion, two hundred one million, two hundred twelve thousand, one".