21344340140123 has 64 divisors (see below), whose sum is σ = 29907424641024. Its totient is φ = 14683456656000.

The previous prime is 21344340140113. The next prime is 21344340140147. The reversal of 21344340140123 is 32104104344312.

It is not a de Polignac number, because 21344340140123 - 2⁸ = 21344340139867 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 21344340140123.

It is not an unprimeable number, because it can be changed into a prime (21344340140113) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 232739708 + ... + 232831398.

It is an arithmetic number, because the mean of its divisors is an integer number (467303510016).

Almost surely, 2^{21344340140123} is an apocalyptic number.

21344340140123 is a gapful number since it is divisible by the number (23) formed by its first and last digit.

21344340140123 is a deficient number, since it is larger than the sum of its proper divisors (8563084500901).

21344340140123 is a wasteful number, since it uses less digits than its factorization.

21344340140123 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 101856.

The product of its (nonzero) digits is 27648, while the sum is 32.

Adding to 21344340140123 its reverse (32104104344312), we get a palindrome (53448444484435).

The spelling of 21344340140123 in words is "twenty-one trillion, three hundred forty-four billion, three hundred forty million, one hundred forty thousand, one hundred twenty-three".