1221211001211 has 8 divisors (see below), whose sum is σ = 1628287618560. Its totient is φ = 814137525672.

The previous prime is 1221211001209. The next prime is 1221211001239. The reversal of 1221211001211 is 1121001121221.

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 1221211001211 - 2¹ = 1221211001209 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1221211001251) 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, 360250 + ... + 1603808.

It is an arithmetic number, because the mean of its divisors is an integer number (203535952320).

Almost surely, 2^{1221211001211} is an apocalyptic number.

1221211001211 is a deficient number, since it is larger than the sum of its proper divisors (407076617349).

1221211001211 is a wasteful number, since it uses less digits than its factorization.

1221211001211 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1570905.

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

Adding to 1221211001211 its reverse (1121001121221), we get a palindrome (2342212122432).

The spelling of 1221211001211 in words is "one trillion, two hundred twenty-one billion, two hundred eleven million, one thousand, two hundred eleven".