21101310212 has 12 divisors (see below), whose sum is σ = 37433146716. Its totient is φ = 10406125440.

The previous prime is 21101310169. The next prime is 21101310253. The reversal of 21101310212 is 21201310112.

It can be written as a sum of positive squares in 2 ways, for example, as 4600366276 + 16500943936 = 67826^2 + 128456^2 .

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, 36132089 + ... + 36132672.

It is an arithmetic number, because the mean of its divisors is an integer number (3119428893).

Almost surely, 2^21101310212 is an apocalyptic number.

It is an amenable number.

21101310212 is a deficient number, since it is larger than the sum of its proper divisors (16331836504).

21101310212 is a wasteful number, since it uses less digits than its factorization.

21101310212 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 72264838 (or 72264836 counting only the distinct ones).

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

Adding to 21101310212 its reverse (21201310112), we get a palindrome (42302620324).

The spelling of 21101310212 in words is "twenty-one billion, one hundred one million, three hundred ten thousand, two hundred twelve".