11231121021 has 32 divisors (see below), whose sum is σ = 15456946176. Its totient is φ = 7249392000.

The previous prime is 11231121017. The next prime is 11231121049. The reversal of 11231121021 is 12012113211.

It is not a de Polignac number, because 11231121021 - 2² = 11231121017 is a prime.

It is a super-2 number, since 2×11231121021² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11231128021) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 11566066 + ... + 11567036.

It is an arithmetic number, because the mean of its divisors is an integer number (483029568).

Almost surely, 2^11231121021 is an apocalyptic number.

It is an amenable number.

11231121021 is a deficient number, since it is larger than the sum of its proper divisors (4225825155).

11231121021 is a wasteful number, since it uses less digits than its factorization.

11231121021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1633.

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

Adding to 11231121021 its reverse (12012113211), we get a palindrome (23243234232).

The spelling of 11231121021 in words is "eleven billion, two hundred thirty-one million, one hundred twenty-one thousand, twenty-one".