21002222143 has 8 divisors (see below), whose sum is σ = 24291727488. Its totient is φ = 17785013784.

The previous prime is 21002222141. The next prime is 21002222159. The reversal of 21002222143 is 34122220012.

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 21002222143 - 2¹ = 21002222141 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 21002222143.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21002222141) 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, 18073621 + ... + 18074782.

It is an arithmetic number, because the mean of its divisors is an integer number (3036465936).

Almost surely, 2^21002222143 is an apocalyptic number.

21002222143 is a deficient number, since it is larger than the sum of its proper divisors (3289505345).

21002222143 is an equidigital number, since it uses as much as digits as its factorization.

21002222143 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 36148493.

The product of its (nonzero) digits is 384, while the sum is 19.

Adding to 21002222143 its reverse (34122220012), we get a palindrome (55124442155).

The spelling of 21002222143 in words is "twenty-one billion, two million, two hundred twenty-two thousand, one hundred forty-three".