21231021011120 has 160 divisors (see below), whose sum is σ = 53658474209280. Its totient is φ = 7782685148160.

The previous prime is 21231021011099. The next prime is 21231021011131. The reversal of 21231021011120 is 2111012013212.

It is a happy number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 115210574 + ... + 115394706.

It is an arithmetic number, because the mean of its divisors is an integer number (335365463808).

Almost surely, 2^{21231021011120} is an apocalyptic number.

21231021011120 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21231021011120, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (26829237104640).

21231021011120 is an abundant number, since it is smaller than the sum of its proper divisors (32427453198160).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21231021011120 is a wasteful number, since it uses less digits than its factorization.

21231021011120 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 186643 (or 186637 counting only the distinct ones).

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

Adding to 21231021011120 its reverse (2111012013212), we get a palindrome (23342033024332).

The spelling of 21231021011120 in words is "twenty-one trillion, two hundred thirty-one billion, twenty-one million, eleven thousand, one hundred twenty".