21123111140 has 48 divisors (see below), whose sum is σ = 44695854000. Its totient is φ = 8385234432.

The previous prime is 21123111137. The next prime is 21123111181. The reversal of 21123111140 is 4111132112.

It can be written as a sum of positive squares in 8 ways, for example, as 209902144 + 20913208996 = 14488^2 + 144614^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1444586 + ... + 1459134.

It is an arithmetic number, because the mean of its divisors is an integer number (931163625).

Almost surely, 2^21123111140 is an apocalyptic number.

21123111140 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21123111140 is an abundant number, since it is smaller than the sum of its proper divisors (23572742860).

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

21123111140 is a wasteful number, since it uses less digits than its factorization.

21123111140 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15104 (or 15102 counting only the distinct ones).

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

Adding to 21123111140 its reverse (4111132112), we get a palindrome (25234243252).

The spelling of 21123111140 in words is "twenty-one billion, one hundred twenty-three million, one hundred eleven thousand, one hundred forty".