11011221020231 has 16 divisors (see below), whose sum is σ = 11677993772544. Its totient is φ = 10346569949184.

The previous prime is 11011221020143. The next prime is 11011221020243. The reversal of 11011221020231 is 13202012211011.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 11011221020231 - 2²⁶ = 11011153911367 is a prime.

It is a super-2 number, since 2×11011221020231² (a number of 27 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (17).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11011221040231) 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, 81197675 + ... + 81333171.

It is an arithmetic number, because the mean of its divisors is an integer number (729874610784).

Almost surely, 2^{11011221020231} is an apocalyptic number.

11011221020231 is a deficient number, since it is larger than the sum of its proper divisors (666772752313).

11011221020231 is a wasteful number, since it uses less digits than its factorization.

11011221020231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 143290.

The product of its (nonzero) digits is 48, while the sum is 17.

Adding to 11011221020231 its reverse (13202012211011), we get a palindrome (24213233231242).

The spelling of 11011221020231 in words is "eleven trillion, eleven billion, two hundred twenty-one million, twenty thousand, two hundred thirty-one".