221001021011 has 2 divisors, whose sum is σ = 221001021012. Its totient is φ = 221001021010.

The previous prime is 221001020987. The next prime is 221001021013. The reversal of 221001021011 is 110120100122.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-221001021011 is a prime.

Together with 221001021013, it forms a pair of twin primes.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 221001020983 and 221001021001.

It is not a weakly prime, because it can be changed into another prime (221001021013) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110500510505 + 110500510506.

It is an arithmetic number, because the mean of its divisors is an integer number (110500510506).

Almost surely, 2^221001021011 is an apocalyptic number.

221001021011 is a deficient number, since it is larger than the sum of its proper divisors (1).

221001021011 is an equidigital number, since it uses as much as digits as its factorization.

221001021011 is an evil number, because the sum of its binary digits is even.

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

Adding to 221001021011 its reverse (110120100122), we get a palindrome (331121121133).

The spelling of 221001021011 in words is "two hundred twenty-one billion, one million, twenty-one thousand, eleven".