2100311321221 has 4 divisors (see below), whose sum is σ = 2100325082944. Its totient is φ = 2100297559500.

The previous prime is 2100311321203. The next prime is 2100311321239. The reversal of 2100311321221 is 1221231130012.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is an interprime number because it is at equal distance from previous prime (2100311321203) and next prime (2100311321239).

It is a cyclic number.

It is not a de Polignac number, because 2100311321221 - 2⁷ = 2100311321093 is a prime.

It is a super-2 number, since 2×2100311321221² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2100311321621) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6649335 + ... + 6958036.

It is an arithmetic number, because the mean of its divisors is an integer number (525081270736).

Almost surely, 2^{2100311321221} is an apocalyptic number.

It is an amenable number.

2100311321221 is a deficient number, since it is larger than the sum of its proper divisors (13761723).

2100311321221 is a wasteful number, since it uses less digits than its factorization.

2100311321221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13761722.

The product of its (nonzero) digits is 144, while the sum is 19.

Adding to 2100311321221 its reverse (1221231130012), we get a palindrome (3321542451233).

The spelling of 2100311321221 in words is "two trillion, one hundred billion, three hundred eleven million, three hundred twenty-one thousand, two hundred twenty-one".