221020011 has 6 divisors (see below), whose sum is σ = 319251140. Its totient is φ = 147346668.

The previous prime is 221020003. The next prime is 221020039. The reversal of 221020011 is 110020122.

It is not a de Polignac number, because 221020011 - 2³ = 221020003 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (9), and also a Moran number because the ratio is a prime number: 24557779 = 221020011 / (2 + 2 + 1 + 0 + 2 + 0 + 0 + 1 + 1).

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 221019975 and 221020002.

It is not an unprimeable number, because it can be changed into a prime (221020001) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 12278881 + ... + 12278898.

Almost surely, 2^221020011 is an apocalyptic number.

221020011 is a deficient number, since it is larger than the sum of its proper divisors (98231129).

221020011 is a wasteful number, since it uses less digits than its factorization.

221020011 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24557785 (or 24557782 counting only the distinct ones).

The product of its (nonzero) digits is 8, while the sum is 9.

The square root of 221020011 is about 14866.7417748476. The cubic root of 221020011 is about 604.6126072220.

Adding to 221020011 its reverse (110020122), we get a palindrome (331040133).

The spelling of 221020011 in words is "two hundred twenty-one million, twenty thousand, eleven".