1121212221201 has 32 divisors (see below), whose sum is σ = 1682896400640. Its totient is φ = 737693856000.

The previous prime is 1121212221137. The next prime is 1121212221209. The reversal of 1121212221201 is 1021222121211.

1121212221201 is a `hidden beast` number, since 11 + 21 + 212 + 221 + 201 = 666.

It is not a de Polignac number, because 1121212221201 - 2⁶ = 1121212221137 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1121212221209) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 187081 + ... + 1509113.

It is an arithmetic number, because the mean of its divisors is an integer number (52590512520).

Almost surely, 2^{1121212221201} is an apocalyptic number.

It is an amenable number.

1121212221201 is a deficient number, since it is larger than the sum of its proper divisors (561684179439).

1121212221201 is a wasteful number, since it uses less digits than its factorization.

1121212221201 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1322454 (or 1322448 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 18.

Adding to 1121212221201 its reverse (1021222121211), we get a palindrome (2142434342412).

It can be divided in two parts, 11 and 21212221201, that added together give a palindrome (21212221212).

The spelling of 1121212221201 in words is "one trillion, one hundred twenty-one billion, two hundred twelve million, two hundred twenty-one thousand, two hundred one".