1211002121211 has 8 divisors (see below), whose sum is σ = 1615071070224. Its totient is φ = 807133959840.

The previous prime is 1211002121209. The next prime is 1211002121233. The reversal of 1211002121211 is 1121212001121.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 1211002121211 - 2¹ = 1211002121209 is a prime.

It is a super-3 number, since 3×1211002121211³ (a number of 37 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is not an unprimeable number, because it can be changed into a prime (1211002141211) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 50182836 + ... + 50206961.

It is an arithmetic number, because the mean of its divisors is an integer number (201883883778).

Almost surely, 2^{1211002121211} is an apocalyptic number.

1211002121211 is a deficient number, since it is larger than the sum of its proper divisors (404068949013).

1211002121211 is a wasteful number, since it uses less digits than its factorization.

1211002121211 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 100393821.

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

Adding to 1211002121211 its reverse (1121212001121), we get a palindrome (2332214122332).

The spelling of 1211002121211 in words is "one trillion, two hundred eleven billion, two million, one hundred twenty-one thousand, two hundred eleven".