21242230512 has 40 divisors (see below), whose sum is σ = 55052250240. Its totient is φ = 7057970880.

The previous prime is 21242230511. The next prime is 21242230517. The reversal of 21242230512 is 21503224212.

It is a Harshad number since it is a multiple of its sum of digits (24).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21242230511) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 696562 + ... + 726417.

It is an arithmetic number, because the mean of its divisors is an integer number (1376306256).

Almost surely, 2^21242230512 is an apocalyptic number.

It is an amenable number.

21242230512 is an abundant number, since it is smaller than the sum of its proper divisors (33810019728).

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

21242230512 is a wasteful number, since it uses less digits than its factorization.

21242230512 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1423301 (or 1423295 counting only the distinct ones).

The product of its (nonzero) digits is 1920, while the sum is 24.

Adding to 21242230512 its reverse (21503224212), we get a palindrome (42745454724).

The spelling of 21242230512 in words is "twenty-one billion, two hundred forty-two million, two hundred thirty thousand, five hundred twelve".