20111121340 has 48 divisors (see below), whose sum is σ = 45260695872. Its totient is φ = 7486718976.

The previous prime is 20111121323. The next prime is 20111121341. The reversal of 20111121340 is 4312111102.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20111121341) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 573789 + ... + 607828.

It is an arithmetic number, because the mean of its divisors is an integer number (942931164).

Almost surely, 2^20111121340 is an apocalyptic number.

20111121340 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20111121340 is an abundant number, since it is smaller than the sum of its proper divisors (25149574532).

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

20111121340 is a wasteful number, since it uses less digits than its factorization.

20111121340 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1181686 (or 1181684 counting only the distinct ones).

The product of its (nonzero) digits is 48, while the sum is 16.

Adding to 20111121340 its reverse (4312111102), we get a palindrome (24423232442).

The spelling of 20111121340 in words is "twenty billion, one hundred eleven million, one hundred twenty-one thousand, three hundred forty".