21002143112 has 16 divisors (see below), whose sum is σ = 39614823360. Its totient is φ = 10438190224.

The previous prime is 21002143079. The next prime is 21002143133. The reversal of 21002143112 is 21134120012.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7858748 + ... + 7861419.

It is an arithmetic number, because the mean of its divisors is an integer number (2475926460).

Almost surely, 2^21002143112 is an apocalyptic number.

It is an amenable number.

21002143112 is a deficient number, since it is larger than the sum of its proper divisors (18612680248).

21002143112 is a wasteful number, since it uses less digits than its factorization.

21002143112 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15720340 (or 15720336 counting only the distinct ones).

The product of its (nonzero) digits is 96, while the sum is 17.

Adding to 21002143112 its reverse (21134120012), we get a palindrome (42136263124).

The spelling of 21002143112 in words is "twenty-one billion, two million, one hundred forty-three thousand, one hundred twelve".