21203315112 has 32 divisors (see below), whose sum is σ = 60580900800. Its totient is φ = 6058089984.

The previous prime is 21203315011. The next prime is 21203315129. The reversal of 21203315112 is 21151330212.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is an unprimeable number.

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, 63104937 + ... + 63105272.

It is an arithmetic number, because the mean of its divisors is an integer number (1893153150).

Almost surely, 2^21203315112 is an apocalyptic number.

It is an amenable number.

21203315112 is an abundant number, since it is smaller than the sum of its proper divisors (39377585688).

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

21203315112 is a wasteful number, since it uses less digits than its factorization.

21203315112 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 126210225 (or 126210221 counting only the distinct ones).

The product of its (nonzero) digits is 360, while the sum is 21.

Adding to 21203315112 its reverse (21151330212), we get a palindrome (42354645324).

The spelling of 21203315112 in words is "twenty-one billion, two hundred three million, three hundred fifteen thousand, one hundred twelve".