21020232012 has 48 divisors (see below), whose sum is σ = 55927140192. Its totient is φ = 6087306240.

The previous prime is 21020232011. The next prime is 21020232043. The reversal of 21020232012 is 21023202012.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 21020231982 and 21020232000.

It is not an unprimeable number, because it can be changed into a prime (21020232011) 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, 3960439 + ... + 3965742.

It is an arithmetic number, because the mean of its divisors is an integer number (1165148754).

Almost surely, 2^21020232012 is an apocalyptic number.

It is an amenable number.

21020232012 is an abundant number, since it is smaller than the sum of its proper divisors (34906908180).

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

21020232012 is a wasteful number, since it uses less digits than its factorization.

21020232012 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7926218 (or 7926216 counting only the distinct ones).

The product of its (nonzero) digits is 96, while the sum is 15.

Adding to 21020232012 its reverse (21023202012), we get a palindrome (42043434024).

The spelling of 21020232012 in words is "twenty-one billion, twenty million, two hundred thirty-two thousand, twelve".