21501030500212 has 24 divisors (see below), whose sum is σ = 37858161045600. Its totient is φ = 10684480208736.

The previous prime is 21501030500197. The next prime is 21501030500267. The reversal of 21501030500212 is 21200503010512.

It is a congruent number.

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, 7111858 + ... + 9673705.

It is an arithmetic number, because the mean of its divisors is an integer number (1577423376900).

Almost surely, 2^{21501030500212} is an apocalyptic number.

It is an amenable number.

21501030500212 is a deficient number, since it is larger than the sum of its proper divisors (16357130545388).

21501030500212 is a wasteful number, since it uses less digits than its factorization.

21501030500212 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16787535 (or 16787533 counting only the distinct ones).

The product of its (nonzero) digits is 600, while the sum is 22.

Adding to 21501030500212 its reverse (21200503010512), we get a palindrome (42701533510724).

The spelling of 21501030500212 in words is "twenty-one trillion, five hundred one billion, thirty million, five hundred thousand, two hundred twelve".