21241420312 has 16 divisors (see below), whose sum is σ = 45517329360. Its totient is φ = 9103465824.

The previous prime is 21241420309. The next prime is 21241420313. The reversal of 21241420312 is 21302414212.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21241420313) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 189655483 + ... + 189655594.

It is an arithmetic number, because the mean of its divisors is an integer number (2844833085).

Almost surely, 2^21241420312 is an apocalyptic number.

It is an amenable number.

21241420312 is an abundant number, since it is smaller than the sum of its proper divisors (24275909048).

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

21241420312 is a wasteful number, since it uses less digits than its factorization.

21241420312 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 379311090 (or 379311086 counting only the distinct ones).

The product of its (nonzero) digits is 768, while the sum is 22.

Adding to 21241420312 its reverse (21302414212), we get a palindrome (42543834524).

The spelling of 21241420312 in words is "twenty-one billion, two hundred forty-one million, four hundred twenty thousand, three hundred twelve".