21302120212 has 12 divisors (see below), whose sum is σ = 37283622516. Its totient is φ = 10649656640.

The previous prime is 21302120207. The next prime is 21302120251. The reversal of 21302120212 is 21202120312.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 12860920836 + 8441199376 = 113406^2 + 91876^2 .

It is a congruent number.

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, 316339 + ... + 377722.

It is an arithmetic number, because the mean of its divisors is an integer number (3106968543).

Almost surely, 2^21302120212 is an apocalyptic number.

It is an amenable number.

21302120212 is a deficient number, since it is larger than the sum of its proper divisors (15981502304).

21302120212 is a wasteful number, since it uses less digits than its factorization.

21302120212 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 701738 (or 701736 counting only the distinct ones).

The product of its (nonzero) digits is 96, while the sum is 16.

Adding to 21302120212 its reverse (21202120312), we get a palindrome (42504240524).

The spelling of 21302120212 in words is "twenty-one billion, three hundred two million, one hundred twenty thousand, two hundred twelve".