21020003312 has 40 divisors (see below), whose sum is σ = 50775595392. Its totient is φ = 8189611200.

The previous prime is 21020003309. The next prime is 21020003429. The reversal of 21020003312 is 21330002012.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (14).

It is a congruent number.

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, 8529614 + ... + 8532077.

Almost surely, 2^21020003312 is an apocalyptic number.

21020003312 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is an amenable number.

21020003312 is an abundant number, since it is smaller than the sum of its proper divisors (29755592080).

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

21020003312 is a wasteful number, since it uses less digits than its factorization.

21020003312 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17061717 (or 17061711 counting only the distinct ones).

The product of its (nonzero) digits is 72, while the sum is 14.

Adding to 21020003312 its reverse (21330002012), we get a palindrome (42350005324).

The spelling of 21020003312 in words is "twenty-one billion, twenty million, three thousand, three hundred twelve".