21423423742567 has 16 divisors (see below), whose sum is σ = 26710417511424. Its totient is φ = 16693142940000.

The previous prime is 21423423742559. The next prime is 21423423742579. The reversal of 21423423742567 is 76524732432412.

It is a cyclic number.

It is not a de Polignac number, because 21423423742567 - 2³ = 21423423742559 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21423423742597) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 619684 + ... + 6575017.

It is an arithmetic number, because the mean of its divisors is an integer number (1669401094464).

Almost surely, 2^{21423423742567} is an apocalyptic number.

21423423742567 is a deficient number, since it is larger than the sum of its proper divisors (5286993768857).

21423423742567 is a wasteful number, since it uses less digits than its factorization.

21423423742567 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7233390.

The product of its digits is 13547520, while the sum is 52.

The spelling of 21423423742567 in words is "twenty-one trillion, four hundred twenty-three billion, four hundred twenty-three million, seven hundred forty-two thousand, five hundred sixty-seven".