1211102211021 has 8 divisors (see below), whose sum is σ = 1642172489760. Its totient is φ = 793716703152.

The previous prime is 1211102211019. The next prime is 1211102211043. The reversal of 1211102211021 is 1201122011121.

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 1211102211021 - 2¹ = 1211102211019 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1211102211721) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3421192510 + ... + 3421192863.

It is an arithmetic number, because the mean of its divisors is an integer number (205271561220).

Almost surely, 2^{1211102211021} is an apocalyptic number.

It is an amenable number.

1211102211021 is a deficient number, since it is larger than the sum of its proper divisors (431070278739).

1211102211021 is an equidigital number, since it uses as much as digits as its factorization.

1211102211021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6842385435.

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

Adding to 1211102211021 its reverse (1201122011121), we get a palindrome (2412224222142).

The spelling of 1211102211021 in words is "one trillion, two hundred eleven billion, one hundred two million, two hundred eleven thousand, twenty-one".