1220121011211 has 8 divisors (see below), whose sum is σ = 1627589290704. Its totient is φ = 813033369600.

The previous prime is 1220121011209. The next prime is 1220121011227. The reversal of 1220121011211 is 1121101210221.

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 1220121011211 - 2¹ = 1220121011209 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1220121011611) 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, 95151990 + ... + 95164811.

It is an arithmetic number, because the mean of its divisors is an integer number (203448661338).

Almost surely, 2^{1220121011211} is an apocalyptic number.

1220121011211 is a deficient number, since it is larger than the sum of its proper divisors (407468279493).

1220121011211 is a wasteful number, since it uses less digits than its factorization.

1220121011211 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 190318941.

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

Adding to 1220121011211 its reverse (1121101210221), we get a palindrome (2341222221432).

The spelling of 1220121011211 in words is "one trillion, two hundred twenty billion, one hundred twenty-one million, eleven thousand, two hundred eleven".