221021303011 has 4 divisors (see below), whose sum is σ = 221170341112. Its totient is φ = 220872264912.

The previous prime is 221021302963. The next prime is 221021303017. The reversal of 221021303011 is 110303120122.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 221021303011 - 2¹⁹ = 221020778723 is a prime.

It is a super-2 number, since 2×221021303011² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (221021303017) 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, 74516826 + ... + 74519791.

It is an arithmetic number, because the mean of its divisors is an integer number (55292585278).

Almost surely, 2^221021303011 is an apocalyptic number.

221021303011 is a deficient number, since it is larger than the sum of its proper divisors (149038101).

221021303011 is a wasteful number, since it uses less digits than its factorization.

221021303011 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 149038100.

The product of its (nonzero) digits is 72, while the sum is 16.

Adding to 221021303011 its reverse (110303120122), we get a palindrome (331324423133).

The spelling of 221021303011 in words is "two hundred twenty-one billion, twenty-one million, three hundred three thousand, eleven".