1211101101021 has 16 divisors (see below), whose sum is σ = 1848120064128. Its totient is φ = 691070520000.

The previous prime is 1211101101013. The next prime is 1211101101037. The reversal of 1211101101021 is 1201011011121.

It is not a de Polignac number, because 1211101101021 - 2³ = 1211101101013 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1211101100988 and 1211101101006.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1211101103021) 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, 41120430 + ... + 41149871.

It is an arithmetic number, because the mean of its divisors is an integer number (115507504008).

Almost surely, 2^{1211101101021} is an apocalyptic number.

It is an amenable number.

1211101101021 is a deficient number, since it is larger than the sum of its proper divisors (637018963107).

1211101101021 is an equidigital number, since it uses as much as digits as its factorization.

1211101101021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 82271012.

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

Adding to 1211101101021 its reverse (1201011011121), we get a palindrome (2412112112142).

The spelling of 1211101101021 in words is "one trillion, two hundred eleven billion, one hundred one million, one hundred one thousand, twenty-one".