11012121231 has 16 divisors (see below), whose sum is σ = 14842629984. Its totient is φ = 7261599744.

The previous prime is 11012121223. The next prime is 11012121271. The reversal of 11012121231 is 13212121011.

11012121231 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 11012121231 - 2³ = 11012121223 is a prime.

It is a super-2 number, since 2×11012121231² (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 11012121231.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11012121221) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 552715 + ... + 572291.

It is an arithmetic number, because the mean of its divisors is an integer number (927664374).

Almost surely, 2^11012121231 is an apocalyptic number.

11012121231 is a deficient number, since it is larger than the sum of its proper divisors (3830508753).

11012121231 is a wasteful number, since it uses less digits than its factorization.

11012121231 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21610.

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

Adding to 11012121231 its reverse (13212121011), we get a palindrome (24224242242).

The spelling of 11012121231 in words is "eleven billion, twelve million, one hundred twenty-one thousand, two hundred thirty-one".