21423424323551 has 8 divisors (see below), whose sum is σ = 21576279339600. Its totient is φ = 21270690289728.

The previous prime is 21423424323527. The next prime is 21423424323559. The reversal of 21423424323551 is 15532342432412.

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

It is a cyclic number.

It is not a de Polignac number, because 21423424323551 - 2²² = 21423420129247 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21423424323499 and 21423424323508.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21423424323559) 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, 29890121 + ... + 30598466.

It is an arithmetic number, because the mean of its divisors is an integer number (2697034917450).

Almost surely, 2^{21423424323551} is an apocalyptic number.

21423424323551 is a deficient number, since it is larger than the sum of its proper divisors (152855016049).

21423424323551 is a wasteful number, since it uses less digits than its factorization.

21423424323551 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 60491113.

The product of its digits is 691200, while the sum is 41.

Adding to 21423424323551 its reverse (15532342432412), we get a palindrome (36955766755963).

The spelling of 21423424323551 in words is "twenty-one trillion, four hundred twenty-three billion, four hundred twenty-four million, three hundred twenty-three thousand, five hundred fifty-one".