21000242312 has 32 divisors (see below), whose sum is σ = 46098097920. Its totient is φ = 8780588160.

The previous prime is 21000242293. The next prime is 21000242327. The reversal of 21000242312 is 21324200012.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4570928 + ... + 4575519.

It is an arithmetic number, because the mean of its divisors is an integer number (1440565560).

Almost surely, 2^21000242312 is an apocalyptic number.

It is an amenable number.

21000242312 is an abundant number, since it is smaller than the sum of its proper divisors (25097855608).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21000242312 is a wasteful number, since it uses less digits than its factorization.

21000242312 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9146501 (or 9146497 counting only the distinct ones).

The product of its (nonzero) digits is 192, while the sum is 17.

Adding to 21000242312 its reverse (21324200012), we get a palindrome (42324442324).

The spelling of 21000242312 in words is "twenty-one billion, two hundred forty-two thousand, three hundred twelve".