12020021012 has 6 divisors (see below), whose sum is σ = 21035036778. Its totient is φ = 6010010504.

The previous prime is 12020021011. The next prime is 12020021047. The reversal of 12020021012 is 21012002021.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 10315652356 + 1704368656 = 101566^2 + 41284^2 .

It is a junction number, because it is equal to n+sod(n) for n = 12020020984 and 12020021002.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12020021011) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1502502623 + ... + 1502502630.

It is an arithmetic number, because the mean of its divisors is an integer number (3505839463).

Almost surely, 2^12020021012 is an apocalyptic number.

It is an amenable number.

12020021012 is a deficient number, since it is larger than the sum of its proper divisors (9015015766).

12020021012 is a wasteful number, since it uses less digits than its factorization.

12020021012 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3005005257 (or 3005005255 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 11.

Adding to 12020021012 its reverse (21012002021), we get a palindrome (33032023033).

The spelling of 12020021012 in words is "twelve billion, twenty million, twenty-one thousand, twelve".