1011133221 has 16 divisors (see below), whose sum is σ = 1551120000. Its totient is φ = 573910848.

The previous prime is 1011133187. The next prime is 1011133229. The reversal of 1011133221 is 1223311101.

It is a happy number.

It is not a de Polignac number, because 1011133221 - 2²¹ = 1009036069 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1011133221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1011133229) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 158446 + ... + 164703.

It is an arithmetic number, because the mean of its divisors is an integer number (96945000).

Almost surely, 2^1011133221 is an apocalyptic number.

It is an amenable number.

1011133221 is a deficient number, since it is larger than the sum of its proper divisors (539986779).

1011133221 is a wasteful number, since it uses less digits than its factorization.

1011133221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 323308.

The product of its (nonzero) digits is 36, while the sum is 15.

The square root of 1011133221 is about 31798.3210405833. The cubic root of 1011133221 is about 1003.6973861537.

Adding to 1011133221 its reverse (1223311101), we get a palindrome (2234444322).

It can be divided in two parts, 1011 and 133221, that multiplied together give a palindrome (134686431).

The spelling of 1011133221 in words is "one billion, eleven million, one hundred thirty-three thousand, two hundred twenty-one".