21440100124423 has 2 divisors, whose sum is σ = 21440100124424. Its totient is φ = 21440100124422.

The previous prime is 21440100124409. The next prime is 21440100124439. The reversal of 21440100124423 is 32442100104412.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21440100124423 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21440100124391 and 21440100124400.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21440100124823) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10720050062211 + 10720050062212.

It is an arithmetic number, because the mean of its divisors is an integer number (10720050062212).

Almost surely, 2^{21440100124423} is an apocalyptic number.

21440100124423 is a deficient number, since it is larger than the sum of its proper divisors (1).

21440100124423 is an equidigital number, since it uses as much as digits as its factorization.

21440100124423 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 6144, while the sum is 28.

Adding to 21440100124423 its reverse (32442100104412), we get a palindrome (53882200228835).

The spelling of 21440100124423 in words is "twenty-one trillion, four hundred forty billion, one hundred million, one hundred twenty-four thousand, four hundred twenty-three".