221021101121211 has 8 divisors (see below), whose sum is σ = 327438668327760. Its totient is φ = 147347400747456.

The previous prime is 221021101121209. The next prime is 221021101121231. The reversal of 221021101121211 is 112121101120122.

It is a happy number.

221021101121211 is a `hidden beast` number, since 2 + 210 + 21 + 101 + 121 + 211 = 666.

221021101121211 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 221021101121211 - 2¹ = 221021101121209 is a prime.

It is a super-2 number, since 2×221021101121211² (a number of 29 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (221021101121231) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4092983354070 + ... + 4092983354123.

It is an arithmetic number, because the mean of its divisors is an integer number (40929833540970).

Almost surely, 2^{221021101121211} is an apocalyptic number.

221021101121211 is a deficient number, since it is larger than the sum of its proper divisors (106417567206549).

221021101121211 is an equidigital number, since it uses as much as digits as its factorization.

221021101121211 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8185966708202 (or 8185966708196 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 18.

Adding to 221021101121211 its reverse (112121101120122), we get a palindrome (333142202241333).

The spelling of 221021101121211 in words is "two hundred twenty-one trillion, twenty-one billion, one hundred one million, one hundred twenty-one thousand, two hundred eleven".