1211000221011 has 32 divisors (see below), whose sum is σ = 1921900704768. Its totient is φ = 663814327680.

The previous prime is 1211000221009. The next prime is 1211000221021. The reversal of 1211000221011 is 1101220001121.

It is not a de Polignac number, because 1211000221011 - 2¹ = 1211000221009 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1211000221021) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 10920600 + ... + 11030933.

It is an arithmetic number, because the mean of its divisors is an integer number (60059397024).

Almost surely, 2^{1211000221011} is an apocalyptic number.

1211000221011 is a deficient number, since it is larger than the sum of its proper divisors (710900483757).

1211000221011 is a wasteful number, since it uses less digits than its factorization.

1211000221011 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21951651.

The product of its (nonzero) digits is 8, while the sum is 12.

Adding to 1211000221011 its reverse (1101220001121), we get a palindrome (2312220222132).

The spelling of 1211000221011 in words is "one trillion, two hundred eleven billion, two hundred twenty-one thousand, eleven".