2212100021 has 2 divisors, whose sum is σ = 2212100022. Its totient is φ = 2212100020.

The previous prime is 2212099991. The next prime is 2212100029. The reversal of 2212100021 is 1200012122.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1712800996 + 499299025 = 41386^2 + 22345^2 .

It is a cyclic number.

It is not a de Polignac number, because 2212100021 - 2²² = 2207905717 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 2212099975 and 2212100011.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2212100029) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1106050010 + 1106050011.

It is an arithmetic number, because the mean of its divisors is an integer number (1106050011).

Almost surely, 2^2212100021 is an apocalyptic number.

It is an amenable number.

2212100021 is a deficient number, since it is larger than the sum of its proper divisors (1).

2212100021 is an equidigital number, since it uses as much as digits as its factorization.

2212100021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 16, while the sum is 11.

The square root of 2212100021 is about 47032.9673845910. The cubic root of 2212100021 is about 1302.9715105031.

Adding to 2212100021 its reverse (1200012122), we get a palindrome (3412112143).

The spelling of 2212100021 in words is "two billion, two hundred twelve million, one hundred thousand, twenty-one".