2111021220221 has 2 divisors, whose sum is σ = 2111021220222. Its totient is φ = 2111021220220.

The previous prime is 2111021220173. The next prime is 2111021220239. The reversal of 2111021220221 is 1220221201112.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1103529240100 + 1007491980121 = 1050490^2 + 1003739^2 .

It is a cyclic number.

It is not a de Polignac number, because 2111021220221 - 2⁶ = 2111021220157 is a prime.

It is a super-4 number, since 4×2111021220221⁴ (a number of 50 digits) contains 4444 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 2111021220221.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2111021220251) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1055510610110 + 1055510610111.

It is an arithmetic number, because the mean of its divisors is an integer number (1055510610111).

Almost surely, 2^{2111021220221} is an apocalyptic number.

It is an amenable number.

2111021220221 is a deficient number, since it is larger than the sum of its proper divisors (1).

2111021220221 is an equidigital number, since it uses as much as digits as its factorization.

2111021220221 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 64, while the sum is 17.

Adding to 2111021220221 its reverse (1220221201112), we get a palindrome (3331242421333).

The spelling of 2111021220221 in words is "two trillion, one hundred eleven billion, twenty-one million, two hundred twenty thousand, two hundred twenty-one".