221121002011 has 32 divisors (see below), whose sum is σ = 279630521856. Its totient is φ = 170169120000.

The previous prime is 221121002009. The next prime is 221121002027. The reversal of 221121002011 is 110200121122.

It is a cyclic number.

It is not a de Polignac number, because 221121002011 - 2¹ = 221121002009 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (13).

It is a junction number, because it is equal to n+sod(n) for n = 221121001982 and 221121002000.

It is not an unprimeable number, because it can be changed into a prime (221121002911) 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, 1145436 + ... + 1324486.

It is an arithmetic number, because the mean of its divisors is an integer number (8738453808).

Almost surely, 2^221121002011 is an apocalyptic number.

221121002011 is a deficient number, since it is larger than the sum of its proper divisors (58509519845).

221121002011 is a wasteful number, since it uses less digits than its factorization.

221121002011 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 179443.

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

Adding to 221121002011 its reverse (110200121122), we get a palindrome (331321123133).

The spelling of 221121002011 in words is "two hundred twenty-one billion, one hundred twenty-one million, two thousand, eleven".