2123401340 has 24 divisors (see below), whose sum is σ = 4468793280. Its totient is φ = 847522368.

The previous prime is 2123401321. The next prime is 2123401349. The reversal of 2123401340 is 431043212.

It is a Harshad number since it is a multiple of its sum of digits (20).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2123401349) 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, 105395 + ... + 123914.

It is an arithmetic number, because the mean of its divisors is an integer number (186199720).

Almost surely, 2^2123401340 is an apocalyptic number.

2123401340 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2123401340 is an abundant number, since it is smaller than the sum of its proper divisors (2345391940).

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

2123401340 is a wasteful number, since it uses less digits than its factorization.

2123401340 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 229781 (or 229779 counting only the distinct ones).

The product of its (nonzero) digits is 576, while the sum is 20.

The square root of 2123401340 is about 46080.3791217043. The cubic root of 2123401340 is about 1285.3183140526.

Adding to 2123401340 its reverse (431043212), we get a palindrome (2554444552).

The spelling of 2123401340 in words is "two billion, one hundred twenty-three million, four hundred one thousand, three hundred forty".