11211231021 has 8 divisors (see below), whose sum is σ = 15598234560. Its totient is φ = 7149190752.

The previous prime is 11211231007. The next prime is 11211231023. The reversal of 11211231021 is 12013211211.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a de Polignac number, because none of the positive numbers 2^k-11211231021 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11211231023) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 81240736 + ... + 81240873.

It is an arithmetic number, because the mean of its divisors is an integer number (1949779320).

Almost surely, 2^11211231021 is an apocalyptic number.

It is an amenable number.

11211231021 is a deficient number, since it is larger than the sum of its proper divisors (4387003539).

11211231021 is a wasteful number, since it uses less digits than its factorization.

11211231021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 162481635.

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

Adding to 11211231021 its reverse (12013211211), we get a palindrome (23224442232).

The spelling of 11211231021 in words is "eleven billion, two hundred eleven million, two hundred thirty-one thousand, twenty-one".