21112367812 has 12 divisors (see below), whose sum is σ = 36986081020. Its totient is φ = 10544916096.

The previous prime is 21112367767. The next prime is 21112367819. The reversal of 21112367812 is 21876321112.

It can be written as a sum of positive squares in 2 ways, for example, as 2685934276 + 18426433536 = 51826^2 + 135744^2 .

It is not an unprimeable number, because it can be changed into a prime (21112367819) 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, 2812737 + ... + 2820232.

Almost surely, 2^21112367812 is an apocalyptic number.

It is an amenable number.

21112367812 is a deficient number, since it is larger than the sum of its proper divisors (15873713208).

21112367812 is a wasteful number, since it uses less digits than its factorization.

21112367812 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5633910 (or 5633908 counting only the distinct ones).

The product of its digits is 8064, while the sum is 34.

Adding to 21112367812 its reverse (21876321112), we get a palindrome (42988688924).

The spelling of 21112367812 in words is "twenty-one billion, one hundred twelve million, three hundred sixty-seven thousand, eight hundred twelve".