20120021205 has 16 divisors (see below), whose sum is σ = 32476921920. Its totient is φ = 10635715328.

The previous prime is 20120021191. The next prime is 20120021293. The reversal of 20120021205 is 50212002102.

It is a cyclic number.

It is not a de Polignac number, because 20120021205 - 2¹² = 20120017109 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (15).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5933415 + ... + 5936804.

It is an arithmetic number, because the mean of its divisors is an integer number (2029807620).

Almost surely, 2^20120021205 is an apocalyptic number.

It is an amenable number.

20120021205 is a deficient number, since it is larger than the sum of its proper divisors (12356900715).

20120021205 is a wasteful number, since it uses less digits than its factorization.

20120021205 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11870340.

The product of its (nonzero) digits is 80, while the sum is 15.

Adding to 20120021205 its reverse (50212002102), we get a palindrome (70332023307).

The spelling of 20120021205 in words is "twenty billion, one hundred twenty million, twenty-one thousand, two hundred five".