1220121221211 has 48 divisors (see below), whose sum is σ = 1834589952000. Its totient is φ = 780454342080.

The previous prime is 1220121221183. The next prime is 1220121221233. The reversal of 1220121221211 is 1121221210221.

1220121221211 is a `hidden beast` number, since 1 + 220 + 1 + 212 + 21 + 211 = 666.

It is not a de Polignac number, because 1220121221211 - 2⁹ = 1220121220699 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1220121221261) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 50786160 + ... + 50810178.

It is an arithmetic number, because the mean of its divisors is an integer number (38220624000).

Almost surely, 2^{1220121221211} is an apocalyptic number.

1220121221211 is a deficient number, since it is larger than the sum of its proper divisors (614468730789).

1220121221211 is a wasteful number, since it uses less digits than its factorization.

1220121221211 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25264 (or 25261 counting only the distinct ones).

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

Adding to 1220121221211 its reverse (1121221210221), we get a palindrome (2341342431432).

The spelling of 1220121221211 in words is "one trillion, two hundred twenty billion, one hundred twenty-one million, two hundred twenty-one thousand, two hundred eleven".