1221200001211 has 8 divisors (see below), whose sum is σ = 1241410419648. Its totient is φ = 1200995736000.

The previous prime is 1221200001209. The next prime is 1221200001227. The reversal of 1221200001211 is 1121000021221.

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

It is a cyclic number.

It is not a de Polignac number, because 1221200001211 - 2¹ = 1221200001209 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1221200001191 and 1221200001200.

It is not an unprimeable number, because it can be changed into a prime (1221200001011) 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, 1137235 + ... + 1932796.

It is an arithmetic number, because the mean of its divisors is an integer number (155176302456).

Almost surely, 2^{1221200001211} is an apocalyptic number.

1221200001211 is a deficient number, since it is larger than the sum of its proper divisors (20210418437).

1221200001211 is an equidigital number, since it uses as much as digits as its factorization.

1221200001211 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3076613.

The product of its (nonzero) digits is 16, while the sum is 13.

Adding to 1221200001211 its reverse (1121000021221), we get a palindrome (2342200022432).

The spelling of 1221200001211 in words is "one trillion, two hundred twenty-one billion, two hundred million, one thousand, two hundred eleven".