21020132012 has 48 divisors (see below), whose sum is σ = 41264643840. Its totient is φ = 9284932800.

The previous prime is 21020131999. The next prime is 21020132017. The reversal of 21020132012 is 21023102012.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (21020132017) 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 15 ways as a sum of consecutive naturals, for example, 1390937 + ... + 1405967.

It is an arithmetic number, because the mean of its divisors is an integer number (859680080).

Almost surely, 2^21020132012 is an apocalyptic number.

21020132012 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is an amenable number.

21020132012 is a deficient number, since it is larger than the sum of its proper divisors (20244511828).

21020132012 is a wasteful number, since it uses less digits than its factorization.

21020132012 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15942 (or 15940 counting only the distinct ones).

The product of its (nonzero) digits is 48, while the sum is 14.

Adding to 21020132012 its reverse (21023102012), we get a palindrome (42043234024).

The spelling of 21020132012 in words is "twenty-one billion, twenty million, one hundred thirty-two thousand, twelve".