21246521143 has 8 divisors (see below), whose sum is σ = 21536153136. Its totient is φ = 20958672000.

The previous prime is 21246521129. The next prime is 21246521159. The reversal of 21246521143 is 34112564212.

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 21246521143 - 2²⁵ = 21212966711 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 (21246521113) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 421708 + ... + 469393.

It is an arithmetic number, because the mean of its divisors is an integer number (2692019142).

Almost surely, 2^21246521143 is an apocalyptic number.

21246521143 is a deficient number, since it is larger than the sum of its proper divisors (289631993).

21246521143 is a wasteful number, since it uses less digits than its factorization.

21246521143 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 891425.

The product of its digits is 11520, while the sum is 31.

The spelling of 21246521143 in words is "twenty-one billion, two hundred forty-six million, five hundred twenty-one thousand, one hundred forty-three".