21142102412 has 12 divisors (see below), whose sum is σ = 38607317616. Its totient is φ = 10111440240.

The previous prime is 21142102391. The next prime is 21142102417. The reversal of 21142102412 is 21420124112.

It is not an unprimeable number, because it can be changed into a prime (21142102417) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 114902639 + ... + 114902822.

It is an arithmetic number, because the mean of its divisors is an integer number (3217276468).

Almost surely, 2^21142102412 is an apocalyptic number.

It is an amenable number.

21142102412 is a deficient number, since it is larger than the sum of its proper divisors (17465215204).

21142102412 is a wasteful number, since it uses less digits than its factorization.

21142102412 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 229805488 (or 229805486 counting only the distinct ones).

The product of its (nonzero) digits is 256, while the sum is 20.

Adding to 21142102412 its reverse (21420124112), we get a palindrome (42562226524).

The spelling of 21142102412 in words is "twenty-one billion, one hundred forty-two million, one hundred two thousand, four hundred twelve".