1222211011 has 4 divisors (see below), whose sum is σ = 1396812592. Its totient is φ = 1047609432.

The previous prime is 1222210993. The next prime is 1222211017. The reversal of 1222211011 is 1101122221.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 1222211011 - 2⁹ = 1222210499 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1222210982 and 1222211000.

It is not an unprimeable number, because it can be changed into a prime (1222211017) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 87300780 + ... + 87300793.

It is an arithmetic number, because the mean of its divisors is an integer number (349203148).

Almost surely, 2^1222211011 is an apocalyptic number.

1222211011 is a deficient number, since it is larger than the sum of its proper divisors (174601581).

1222211011 is an equidigital number, since it uses as much as digits as its factorization.

1222211011 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 174601580.

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

The square root of 1222211011 is about 34960.1345964228. The cubic root of 1222211011 is about 1069.1748408631.

Adding to 1222211011 its reverse (1101122221), we get a palindrome (2323333232).

The spelling of 1222211011 in words is "one billion, two hundred twenty-two million, two hundred eleven thousand, eleven".