21210444143 has 12 divisors (see below), whose sum is σ = 24722454960. Its totient is φ = 18144215712.

The previous prime is 21210444121. The next prime is 21210444161. The reversal of 21210444143 is 34144401212.

It is a de Polignac number, because none of the positive numbers 2^k-21210444143 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21210444163) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 405638 + ... + 454931.

It is an arithmetic number, because the mean of its divisors is an integer number (2060204580).

Almost surely, 2^21210444143 is an apocalyptic number.

21210444143 is a deficient number, since it is larger than the sum of its proper divisors (3512010817).

21210444143 is an equidigital number, since it uses as much as digits as its factorization.

21210444143 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 861086 (or 861079 counting only the distinct ones).

The product of its (nonzero) digits is 3072, while the sum is 26.

Adding to 21210444143 its reverse (34144401212), we get a palindrome (55354845355).

The spelling of 21210444143 in words is "twenty-one billion, two hundred ten million, four hundred forty-four thousand, one hundred forty-three".