21340222012423 has 8 divisors (see below), whose sum is σ = 21344520676976. Its totient is φ = 21335923627200.

The previous prime is 21340222012409. The next prime is 21340222012489. The reversal of 21340222012423 is 32421022204312.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21340222012423 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21340222012391 and 21340222012400.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21340222013423) 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, 217617283 + ... + 217715323.

It is an arithmetic number, because the mean of its divisors is an integer number (2668065084622).

Almost surely, 2^{21340222012423} is an apocalyptic number.

21340222012423 is a deficient number, since it is larger than the sum of its proper divisors (4298664553).

21340222012423 is an equidigital number, since it uses as much as digits as its factorization.

21340222012423 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 139665.

The product of its (nonzero) digits is 9216, while the sum is 28.

Adding to 21340222012423 its reverse (32421022204312), we get a palindrome (53761244216735).

The spelling of 21340222012423 in words is "twenty-one trillion, three hundred forty billion, two hundred twenty-two million, twelve thousand, four hundred twenty-three".