21423414236537 has 4 divisors (see below), whose sum is σ = 21460543204596. Its totient is φ = 21386285268480.

The previous prime is 21423414236513. The next prime is 21423414236561. The reversal of 21423414236537 is 73563241432412.

It is a semiprime because it is the product of two primes.

It is an interprime number because it is at equal distance from previous prime (21423414236513) and next prime (21423414236561).

It can be written as a sum of positive squares in 2 ways, for example, as 17448239597881 + 3975174638656 = 4177109^2 + 1993784^2 .

It is a cyclic number.

It is not a de Polignac number, because 21423414236537 - 2²⁸ = 21423145801081 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21423414236491 and 21423414236500.

It is not an unprimeable number, because it can be changed into a prime (21423414236137) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 18564483164 + ... + 18564484317.

It is an arithmetic number, because the mean of its divisors is an integer number (5365135801149).

Almost surely, 2^{21423414236537} is an apocalyptic number.

It is an amenable number.

21423414236537 is a deficient number, since it is larger than the sum of its proper divisors (37128968059).

21423414236537 is an equidigital number, since it uses as much as digits as its factorization.

21423414236537 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 37128968058.

The product of its digits is 2903040, while the sum is 47.

Adding to 21423414236537 its reverse (73563241432412), we get a palindrome (94986655668949).

The spelling of 21423414236537 in words is "twenty-one trillion, four hundred twenty-three billion, four hundred fourteen million, two hundred thirty-six thousand, five hundred thirty-seven".