2102211101021 has 4 divisors (see below), whose sum is σ = 2102214254844. Its totient is φ = 2102207947200.

The previous prime is 2102211100949. The next prime is 2102211101033. The reversal of 2102211101021 is 1201011122012.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 1147019580100 + 955191520921 = 1070990^2 + 977339^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2102211101021 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 2102211100987 and 2102211101005.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2102211101071) 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 3 ways as a sum of consecutive naturals, for example, 141590 + ... + 2055351.

It is an arithmetic number, because the mean of its divisors is an integer number (525553563711).

Almost surely, 2^{2102211101021} is an apocalyptic number.

It is an amenable number.

2102211101021 is a deficient number, since it is larger than the sum of its proper divisors (3153823).

2102211101021 is an equidigital number, since it uses as much as digits as its factorization.

2102211101021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3153822.

The product of its (nonzero) digits is 16, while the sum is 14.

Adding to 2102211101021 its reverse (1201011122012), we get a palindrome (3303222223033).

The spelling of 2102211101021 in words is "two trillion, one hundred two billion, two hundred eleven million, one hundred one thousand, twenty-one".