221000011011 has 32 divisors (see below), whose sum is σ = 361192453440. Its totient is φ = 132682924800.

The previous prime is 221000010991. The next prime is 221000011049. The reversal of 221000011011 is 110110000122.

It is a happy number.

It is not a de Polignac number, because 221000011011 - 2⁷ = 221000010883 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (9).

It is a junction number, because it is equal to n+sod(n) for n = 221000010984 and 221000011002.

It is not an unprimeable number, because it can be changed into a prime (221000011081) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 7664020 + ... + 7692801.

It is an arithmetic number, because the mean of its divisors is an integer number (11287264170).

Almost surely, 2^221000011011 is an apocalyptic number.

221000011011 is a deficient number, since it is larger than the sum of its proper divisors (140192442429).

221000011011 is a wasteful number, since it uses less digits than its factorization.

221000011011 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15356884 (or 15356878 counting only the distinct ones).

The product of its (nonzero) digits is 4, while the sum is 9.

Adding to 221000011011 its reverse (110110000122), we get a palindrome (331110011133).

The spelling of 221000011011 in words is "two hundred twenty-one billion, eleven thousand, eleven".