1220211101211 has 16 divisors (see below), whose sum is σ = 1674528551808. Its totient is φ = 789871924800.

The previous prime is 1220211101203. The next prime is 1220211101269. The reversal of 1220211101211 is 1121011120221.

It is a happy number.

It is not a de Polignac number, because 1220211101211 - 2³ = 1220211101203 is a prime.

It is a super-2 number, since 2×1220211101211² (a number of 25 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (1220211101911) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 23482141 + ... + 23534046.

It is an arithmetic number, because the mean of its divisors is an integer number (104658034488).

Almost surely, 2^{1220211101211} is an apocalyptic number.

1220211101211 is a deficient number, since it is larger than the sum of its proper divisors (454317450597).

1220211101211 is a wasteful number, since it uses less digits than its factorization.

1220211101211 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 47016442.

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

Adding to 1220211101211 its reverse (1121011120221), we get a palindrome (2341222221432).

The spelling of 1220211101211 in words is "one trillion, two hundred twenty billion, two hundred eleven million, one hundred one thousand, two hundred eleven".