221021013211 has 2 divisors, whose sum is σ = 221021013212. Its totient is φ = 221021013210.

The previous prime is 221021013107. The next prime is 221021013247. The reversal of 221021013211 is 112310120122.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 221021013211 - 2¹⁷ = 221020882139 is a prime.

It is not a weakly prime, because it can be changed into another prime (221021013281) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110510506605 + 110510506606.

It is an arithmetic number, because the mean of its divisors is an integer number (110510506606).

Almost surely, 2^221021013211 is an apocalyptic number.

221021013211 is a deficient number, since it is larger than the sum of its proper divisors (1).

221021013211 is an equidigital number, since it uses as much as digits as its factorization.

221021013211 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 48, while the sum is 16.

Adding to 221021013211 its reverse (112310120122), we get a palindrome (333331133333).

The spelling of 221021013211 in words is "two hundred twenty-one billion, twenty-one million, thirteen thousand, two hundred eleven".