21143240013 has 8 divisors (see below), whose sum is σ = 32218270528. Its totient is φ = 12081851424.

The previous prime is 21143239993. The next prime is 21143240029. The reversal of 21143240013 is 31004234112.

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

It is not a de Polignac number, because 21143240013 - 2⁵ = 21143239981 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (21), and also a Moran number because the ratio is a prime number: 1006820953 = 21143240013 / (2 + 1 + 1 + 4 + 3 + 2 + 4 + 0 + 0 + 1 + 3).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21143240813) 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, 503410456 + ... + 503410497.

It is an arithmetic number, because the mean of its divisors is an integer number (4027283816).

Almost surely, 2^21143240013 is an apocalyptic number.

It is an amenable number.

21143240013 is a deficient number, since it is larger than the sum of its proper divisors (11075030515).

21143240013 is a wasteful number, since it uses less digits than its factorization.

21143240013 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1006820963.

The product of its (nonzero) digits is 576, while the sum is 21.

Adding to 21143240013 its reverse (31004234112), we get a palindrome (52147474125).

The spelling of 21143240013 in words is "twenty-one billion, one hundred forty-three million, two hundred forty thousand, thirteen".