21050120312 has 32 divisors (see below), whose sum is σ = 42687524880. Its totient is φ = 9673731840.

The previous prime is 21050120303. The next prime is 21050120317. The reversal of 21050120312 is 21302105012.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21050120317) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 410114 + ... + 458577.

Almost surely, 2^21050120312 is an apocalyptic number.

It is an amenable number.

21050120312 is an abundant number, since it is smaller than the sum of its proper divisors (21637404568).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21050120312 is a wasteful number, since it uses less digits than its factorization.

21050120312 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 868943 (or 868939 counting only the distinct ones).

The product of its (nonzero) digits is 120, while the sum is 17.

Adding to 21050120312 its reverse (21302105012), we get a palindrome (42352225324).

The spelling of 21050120312 in words is "twenty-one billion, fifty million, one hundred twenty thousand, three hundred twelve".