11211021231 has 64 divisors (see below), whose sum is σ = 16692480000. Its totient is φ = 6664194432.

The previous prime is 11211021187. The next prime is 11211021247. The reversal of 11211021231 is 13212011211.

It is not a de Polignac number, because 11211021231 - 2¹⁹ = 11210496943 is a prime.

It is a super-2 number, since 2×11211021231² (a number of 21 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 11211021231.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11211021131) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 13555840 + ... + 13556666.

It is an arithmetic number, because the mean of its divisors is an integer number (260820000).

Almost surely, 2^11211021231 is an apocalyptic number.

11211021231 is a deficient number, since it is larger than the sum of its proper divisors (5481458769).

11211021231 is a wasteful number, since it uses less digits than its factorization.

11211021231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1076.

The product of its (nonzero) digits is 24, while the sum is 15.

Adding to 11211021231 its reverse (13212011211), we get a palindrome (24423032442).

The spelling of 11211021231 in words is "eleven billion, two hundred eleven million, twenty-one thousand, two hundred thirty-one".