20120221012 has 12 divisors (see below), whose sum is σ = 35211396276. Its totient is φ = 10059822080.

The previous prime is 20120221007. The next prime is 20120221067. The reversal of 20120221012 is 21012202102.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 19053937296 + 1066283716 = 138036^2 + 32654^2 .

It is a junction number, because it is equal to n+sod(n) for n = 20120220983 and 20120221001.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 193812 + ... + 278932.

It is an arithmetic number, because the mean of its divisors is an integer number (2934283023).

Almost surely, 2^20120221012 is an apocalyptic number.

It is an amenable number.

20120221012 is a deficient number, since it is larger than the sum of its proper divisors (15091175264).

20120221012 is a wasteful number, since it uses less digits than its factorization.

20120221012 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 144218 (or 144216 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 13.

Adding to 20120221012 its reverse (21012202102), we get a palindrome (41132423114).

The spelling of 20120221012 in words is "twenty billion, one hundred twenty million, two hundred twenty-one thousand, twelve".