1201212212221 has 16 divisors (see below), whose sum is σ = 1402481074176. Its totient is φ = 1007374452336.

The previous prime is 1201212212197. The next prime is 1201212212231. The reversal of 1201212212221 is 1222122121021.

It is not a de Polignac number, because 1201212212221 - 2¹¹ = 1201212210173 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1201212212231) 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, 413820 + ... + 1604266.

It is an arithmetic number, because the mean of its divisors is an integer number (87655067136).

Almost surely, 2^{1201212212221} is an apocalyptic number.

It is an amenable number.

1201212212221 is a deficient number, since it is larger than the sum of its proper divisors (201268861955).

1201212212221 is a wasteful number, since it uses less digits than its factorization.

1201212212221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1193568.

The product of its (nonzero) digits is 128, while the sum is 19.

Adding to 1201212212221 its reverse (1222122121021), we get a palindrome (2423334333242).

The spelling of 1201212212221 in words is "one trillion, two hundred one billion, two hundred twelve million, two hundred twelve thousand, two hundred twenty-one".