21031010212 has 24 divisors (see below), whose sum is σ = 36923886720. Its totient is φ = 10481378880.

The previous prime is 21031010171. The next prime is 21031010213. The reversal of 21031010212 is 21201013012.

It is a junction number, because it is equal to n+sod(n) for n = 21031010192 and 21031010201.

It is not an unprimeable number, because it can be changed into a prime (21031010213) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1879089 + ... + 1890247.

It is an arithmetic number, because the mean of its divisors is an integer number (1538495280).

Almost surely, 2^21031010212 is an apocalyptic number.

It is an amenable number.

21031010212 is a deficient number, since it is larger than the sum of its proper divisors (15892876508).

21031010212 is a wasteful number, since it uses less digits than its factorization.

21031010212 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12651 (or 12649 counting only the distinct ones).

The product of its (nonzero) digits is 24, while the sum is 13.

Adding to 21031010212 its reverse (21201013012), we get a palindrome (42232023224).

The spelling of 21031010212 in words is "twenty-one billion, thirty-one million, ten thousand, two hundred twelve".