21512454233423 has 8 divisors (see below), whose sum is σ = 23117861266992. Its totient is φ = 19944821483136.

The previous prime is 21512454233407. The next prime is 21512454233429. The reversal of 21512454233423 is 32433245421512.

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 21512454233423 - 2⁴ = 21512454233407 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21512454233429) 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, 9443569640 + ... + 9443571917.

It is an arithmetic number, because the mean of its divisors is an integer number (2889732658374).

Almost surely, 2^{21512454233423} is an apocalyptic number.

21512454233423 is a deficient number, since it is larger than the sum of its proper divisors (1605407033569).

21512454233423 is a wasteful number, since it uses less digits than its factorization.

21512454233423 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18887141641.

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

Adding to 21512454233423 its reverse (32433245421512), we get a palindrome (53945699654935).

The spelling of 21512454233423 in words is "twenty-one trillion, five hundred twelve billion, four hundred fifty-four million, two hundred thirty-three thousand, four hundred twenty-three".