2211023821 has 2 divisors, whose sum is σ = 2211023822. Its totient is φ = 2211023820.

The previous prime is 2211023807. The next prime is 2211023827. The reversal of 2211023821 is 1283201122.

2211023821 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 2093062500 + 117961321 = 45750^2 + 10861^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2211023821 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 2211023792 and 2211023801.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2211023827) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1105511910 + 1105511911.

It is an arithmetic number, because the mean of its divisors is an integer number (1105511911).

Almost surely, 2^2211023821 is an apocalyptic number.

It is an amenable number.

2211023821 is a deficient number, since it is larger than the sum of its proper divisors (1).

2211023821 is an equidigital number, since it uses as much as digits as its factorization.

2211023821 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 384, while the sum is 22.

The square root of 2211023821 is about 47021.5250816049. The cubic root of 2211023821 is about 1302.7601750617.

Adding to 2211023821 its reverse (1283201122), we get a palindrome (3494224943).

The spelling of 2211023821 in words is "two billion, two hundred eleven million, twenty-three thousand, eight hundred twenty-one".