1012221011 has 4 divisors (see below), whose sum is σ = 1013187000. Its totient is φ = 1011255024.

The previous prime is 1012220983. The next prime is 1012221013. The reversal of 1012221011 is 1101222101.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1101222101 = 7 ⋅157317443.

It is a cyclic number.

It is not a de Polignac number, because 1012221011 - 2²² = 1008026707 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1012220983 and 1012221001.

It is not an unprimeable number, because it can be changed into a prime (1012221013) 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, 481421 + ... + 483518.

It is an arithmetic number, because the mean of its divisors is an integer number (253296750).

Almost surely, 2^1012221011 is an apocalyptic number.

1012221011 is a deficient number, since it is larger than the sum of its proper divisors (965989).

1012221011 is an equidigital number, since it uses as much as digits as its factorization.

1012221011 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 965988.

The product of its (nonzero) digits is 8, while the sum is 11.

The square root of 1012221011 is about 31815.4209621686. The cubic root of 1012221011 is about 1004.0571873030.

Adding to 1012221011 its reverse (1101222101), we get a palindrome (2113443112).

The spelling of 1012221011 in words is "one billion, twelve million, two hundred twenty-one thousand, eleven".