21012031112 has 16 divisors (see below), whose sum is σ = 39787634700. Its totient is φ = 10401995200.

The previous prime is 21012031109. The next prime is 21012031129. The reversal of 21012031112 is 21113021012.

It can be written as a sum of positive squares in 2 ways, for example, as 14210070436 + 6801960676 = 119206^2 + 82474^2 .

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, 13001687 + ... + 13003302.

Almost surely, 2^21012031112 is an apocalyptic number.

It is an amenable number.

21012031112 is a deficient number, since it is larger than the sum of its proper divisors (18775603588).

21012031112 is a wasteful number, since it uses less digits than its factorization.

21012031112 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26005096 (or 26005092 counting only the distinct ones).

The product of its (nonzero) digits is 24, while the sum is 14.

Adding to 21012031112 its reverse (21113021012), we get a palindrome (42125052124).

The spelling of 21012031112 in words is "twenty-one billion, twelve million, thirty-one thousand, one hundred twelve".