20121221201052 has 24 divisors (see below), whose sum is σ = 46949797724032. Its totient is φ = 6707033506800.

The previous prime is 20121221201051. The next prime is 20121221201071. The reversal of 20121221201052 is 25010212212102.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20121221201051) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2908474 + ... + 6978657.

Almost surely, 2^{20121221201052} is an apocalyptic number.

It is an amenable number.

20121221201052 is an abundant number, since it is smaller than the sum of its proper divisors (26828576522980).

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

20121221201052 is a wasteful number, since it uses less digits than its factorization.

20121221201052 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10056729 (or 10056727 counting only the distinct ones).

The product of its (nonzero) digits is 320, while the sum is 21.

Adding to 20121221201052 its reverse (25010212212102), we get a palindrome (45131433413154).

The spelling of 20121221201052 in words is "twenty trillion, one hundred twenty-one billion, two hundred twenty-one million, two hundred one thousand, fifty-two".