21414440423 has 2 divisors, whose sum is σ = 21414440424. Its totient is φ = 21414440422.

The previous prime is 21414440393. The next prime is 21414440501. The reversal of 21414440423 is 32404441412.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21414440423 - 2²² = 21410246119 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21414440123) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10707220211 + 10707220212.

It is an arithmetic number, because the mean of its divisors is an integer number (10707220212).

Almost surely, 2^21414440423 is an apocalyptic number.

21414440423 is a deficient number, since it is larger than the sum of its proper divisors (1).

21414440423 is an equidigital number, since it uses as much as digits as its factorization.

21414440423 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 12288, while the sum is 29.

Adding to 21414440423 its reverse (32404441412), we get a palindrome (53818881835).

The spelling of 21414440423 in words is "twenty-one billion, four hundred fourteen million, four hundred forty thousand, four hundred twenty-three".