21022442143 has 8 divisors (see below), whose sum is σ = 21303612288. Its totient is φ = 20742941184.

The previous prime is 21022442081. The next prime is 21022442153. The reversal of 21022442143 is 34124422012.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21022442143 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 (21022442153) 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, 391930 + ... + 442327.

It is an arithmetic number, because the mean of its divisors is an integer number (2662951536).

Almost surely, 2^21022442143 is an apocalyptic number.

21022442143 is a deficient number, since it is larger than the sum of its proper divisors (281170145).

21022442143 is a wasteful number, since it uses less digits than its factorization.

21022442143 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 834593.

The product of its (nonzero) digits is 3072, while the sum is 25.

Adding to 21022442143 its reverse (34124422012), we get a palindrome (55146864155).

The spelling of 21022442143 in words is "twenty-one billion, twenty-two million, four hundred forty-two thousand, one hundred forty-three".