1211110110021 has 16 divisors (see below), whose sum is σ = 1846205324928. Its totient is φ = 691798843200.

The previous prime is 1211110109971. The next prime is 1211110110083. The reversal of 1211110110021 is 1200110111121.

It is not a de Polignac number, because 1211110110021 - 2¹⁸ = 1211109847877 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1211110109979 and 1211110110006.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1211110112021) 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 15 ways as a sum of consecutive naturals, for example, 10946850 + ... + 11056931.

It is an arithmetic number, because the mean of its divisors is an integer number (115387832808).

Almost surely, 2^{1211110110021} is an apocalyptic number.

It is an amenable number.

1211110110021 is a deficient number, since it is larger than the sum of its proper divisors (635095214907).

1211110110021 is a wasteful number, since it uses less digits than its factorization.

1211110110021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22006412.

The product of its (nonzero) digits is 4, while the sum is 12.

Adding to 1211110110021 its reverse (1200110111121), we get a palindrome (2411220221142).

The spelling of 1211110110021 in words is "one trillion, two hundred eleven billion, one hundred ten million, one hundred ten thousand, twenty-one".