2211211000021 has 2 divisors, whose sum is σ = 2211211000022. Its totient is φ = 2211211000020.

The previous prime is 2211211000013. The next prime is 2211211000067. The reversal of 2211211000021 is 1200001121122.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 2025751577521 + 185459422500 = 1423289^2 + 430650^2 .

It is a cyclic number.

It is not a de Polignac number, because 2211211000021 - 2³ = 2211211000013 is a prime.

It is a super-2 number, since 2×2211211000021² (a number of 25 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 2211210999965 and 2211211000010.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2211211000001) 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 as a sum of consecutive naturals, namely, 1105605500010 + 1105605500011.

It is an arithmetic number, because the mean of its divisors is an integer number (1105605500011).

Almost surely, 2^{2211211000021} is an apocalyptic number.

It is an amenable number.

2211211000021 is a deficient number, since it is larger than the sum of its proper divisors (1).

2211211000021 is an equidigital number, since it uses as much as digits as its factorization.

2211211000021 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 16, while the sum is 13.

Adding to 2211211000021 its reverse (1200001121122), we get a palindrome (3411212121143).

The spelling of 2211211000021 in words is "two trillion, two hundred eleven billion, two hundred eleven million, twenty-one", and thus it is an aban number.